Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
Jun. 30, 2024 | Mar. 31, 2024 |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | $ 714 | $ 2,083 |
Year two, originated, fiscal year before current fiscal year | 1,900 | 1,381 |
Year three, originated, two years before current fiscal year | 1,213 | 1,117 |
Year four, originated, three years before current fiscal year | 1,011 | 1,026 |
Year five, originated, four years before current fiscal year | 978 | 235 |
Originated, more than five years before current fiscal year | 1,092 | 945 |
Revolving loans | 9,666 | 9,394 |
Total | 16,574 | 16,181 |
Gross Charge-Offs, Total | 0 | 0 |
Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 9,868 | 35,823 |
Year two, originated, fiscal year before current fiscal year | 33,343 | 23,173 |
Year three, originated, two years before current fiscal year | 20,969 | 15,639 |
Year four, originated, three years before current fiscal year | 13,973 | 8,878 |
Year five, originated, four years before current fiscal year | 7,627 | 2,783 |
Originated, more than five years before current fiscal year | 2,748 | 829 |
Total | 88,528 | 87,125 |
Gross Charge-Offs, year one, originated, current fiscal year | 0 | 38 |
Gross Charge-Offs, Year two, originated, fiscal year before current fiscal year | 43 | 297 |
Gross Charge-Offs, Year three, originated, two years before current fiscal year | 74 | 258 |
Gross Charge-Offs, Year four, originated, three years before current fiscal year | 50 | 111 |
Gross Charge-Offs, Year five, originated, four years before current fiscal year | 20 | 38 |
Gross Charge-Offs, Originated, more than five years before current fiscal year | 11 | 34 |
Gross Charge-Offs, Total | 198 | 776 |
Current [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 9,847 | 35,407 |
Year two, originated, fiscal year before current fiscal year | 32,739 | 22,473 |
Year three, originated, two years before current fiscal year | 20,203 | 15,041 |
Year four, originated, three years before current fiscal year | 13,348 | 8,539 |
Year five, originated, four years before current fiscal year | 7,288 | 2,654 |
Originated, more than five years before current fiscal year | 2,560 | 748 |
Total | 85,985 | 84,862 |
30-59 Days Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 21 | 301 |
Year two, originated, fiscal year before current fiscal year | 420 | 488 |
Year three, originated, two years before current fiscal year | 518 | 426 |
Year four, originated, three years before current fiscal year | 433 | 242 |
Year five, originated, four years before current fiscal year | 236 | 92 |
Originated, more than five years before current fiscal year | 124 | 53 |
Total | 1,752 | 1,602 |
60-89 Days Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 77 |
Year two, originated, fiscal year before current fiscal year | 133 | 143 |
Year three, originated, two years before current fiscal year | 177 | 119 |
Year four, originated, three years before current fiscal year | 141 | 68 |
Year five, originated, four years before current fiscal year | 77 | 27 |
Originated, more than five years before current fiscal year | 44 | 17 |
Total | 572 | 451 |
90 Days or Greater Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 38 |
Year two, originated, fiscal year before current fiscal year | 51 | 69 |
Year three, originated, two years before current fiscal year | 71 | 53 |
Year four, originated, three years before current fiscal year | 51 | 29 |
Year five, originated, four years before current fiscal year | 26 | 10 |
Originated, more than five years before current fiscal year | 20 | 11 |
Total | 219 | 210 |
Wholesale [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 6,608 | 6,673 |
Total | 6,608 | 6,673 |
Wholesale [Member] | Performing [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 6,183 | 6,287 |
Total | 6,183 | 6,287 |
Wholesale [Member] | Credit Watch [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 290 | 238 |
Total | 290 | 238 |
Wholesale [Member] | At Risk [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 99 | 112 |
Total | 99 | 112 |
Wholesale [Member] | Default [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 36 | 36 |
Total | 36 | 36 |
Real estate [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 457 | 1,294 |
Year two, originated, fiscal year before current fiscal year | 1,184 | 923 |
Year three, originated, two years before current fiscal year | 903 | 869 |
Year four, originated, three years before current fiscal year | 783 | 891 |
Year five, originated, four years before current fiscal year | 849 | 128 |
Originated, more than five years before current fiscal year | 836 | 786 |
Revolving loans | 81 | 3 |
Total | 5,093 | 4,894 |
Real estate [Member] | Performing [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 397 | 1,224 |
Year two, originated, fiscal year before current fiscal year | 1,115 | 883 |
Year three, originated, two years before current fiscal year | 901 | 815 |
Year four, originated, three years before current fiscal year | 755 | 860 |
Year five, originated, four years before current fiscal year | 811 | 128 |
Originated, more than five years before current fiscal year | 828 | 784 |
Revolving loans | 81 | 3 |
Total | 4,888 | 4,697 |
Real estate [Member] | Credit Watch [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 55 | 58 |
Year two, originated, fiscal year before current fiscal year | 60 | 37 |
Year three, originated, two years before current fiscal year | 0 | 44 |
Year four, originated, three years before current fiscal year | 21 | 6 |
Year five, originated, four years before current fiscal year | 14 | 0 |
Originated, more than five years before current fiscal year | 6 | 0 |
Revolving loans | 0 | 0 |
Total | 156 | 145 |
Real estate [Member] | At Risk [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 8 |
Year two, originated, fiscal year before current fiscal year | 9 | 1 |
Year three, originated, two years before current fiscal year | 0 | 10 |
Year four, originated, three years before current fiscal year | 7 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 2 | 2 |
Revolving loans | 0 | 0 |
Total | 18 | 21 |
Real estate [Member] | Default [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 5 | 4 |
Year two, originated, fiscal year before current fiscal year | 0 | 2 |
Year three, originated, two years before current fiscal year | 2 | 0 |
Year four, originated, three years before current fiscal year | 0 | 25 |
Year five, originated, four years before current fiscal year | 24 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 0 | 0 |
Total | 31 | 31 |
Working capital [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 257 | 789 |
Year two, originated, fiscal year before current fiscal year | 716 | 458 |
Year three, originated, two years before current fiscal year | 310 | 248 |
Year four, originated, three years before current fiscal year | 228 | 135 |
Year five, originated, four years before current fiscal year | 129 | 107 |
Originated, more than five years before current fiscal year | 256 | 159 |
Revolving loans | 2,977 | 2,718 |
Total | 4,873 | 4,614 |
Working capital [Member] | Performing [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 247 | 769 |
Year two, originated, fiscal year before current fiscal year | 702 | 414 |
Year three, originated, two years before current fiscal year | 292 | 235 |
Year four, originated, three years before current fiscal year | 222 | 122 |
Year five, originated, four years before current fiscal year | 116 | 105 |
Originated, more than five years before current fiscal year | 256 | 159 |
Revolving loans | 2,973 | 2,715 |
Total | 4,808 | 4,519 |
Working capital [Member] | Credit Watch [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 10 | 20 |
Year two, originated, fiscal year before current fiscal year | 14 | 41 |
Year three, originated, two years before current fiscal year | 15 | 13 |
Year four, originated, three years before current fiscal year | 6 | 0 |
Year five, originated, four years before current fiscal year | 0 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 3 | 2 |
Total | 48 | 76 |
Working capital [Member] | At Risk [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 3 |
Year three, originated, two years before current fiscal year | 3 | 0 |
Year four, originated, three years before current fiscal year | 0 | 0 |
Year five, originated, four years before current fiscal year | 0 | 2 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 1 | 1 |
Total | 4 | 6 |
Working capital [Member] | Default [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 0 | 0 |
Year two, originated, fiscal year before current fiscal year | 0 | 0 |
Year three, originated, two years before current fiscal year | 0 | 0 |
Year four, originated, three years before current fiscal year | 0 | 13 |
Year five, originated, four years before current fiscal year | 13 | 0 |
Originated, more than five years before current fiscal year | 0 | 0 |
Revolving loans | 0 | 0 |
Total | $ 13 | $ 13 |