Revenue Recognition (Performance Obligations) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | $ 451 | $ 444 | $ 436 | $ 400 |
Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 156 | 161 | | |
Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 143 | 136 | | |
Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 86 | 81 | | |
Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | [1] | 60 | 59 | | |
Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 4 | 6 | | |
Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 2 | $ 1 | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 371 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 89 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 134 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 86 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 57 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 | Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 2 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 41 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 35 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 2 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 1 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 19 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 15 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 1 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 | Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 20 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 17 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 | Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 0 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
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[1] Includes contractual liabilities to accommodate members for cancellations due to unexpected events. These amounts are included within Accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets. | |