| Cover | Nov. 12, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 12, 2024 |
| Entity File Number | 001-41711 |
| Entity Registrant Name | Inflection Point Acquisition Corp. II |
| Entity Central Index Key | 0001970622 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 167 Madison Avenue Suite 205 #1017 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10016 |
| City Area Code | (212) |
| Local Phone Number | 476-6908 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-half of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-half of one redeemable warrant |
| Trading Symbol | IPXXU |
| Security Exchange Name | NASDAQ |
| Class A ordinary shares, par value $0.0001 per share | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | IPXX |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share |
| Trading Symbol | IPXXW |
| Security Exchange Name | NASDAQ |
