| Cover | Oct. 25, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 25, 2024 |
| Entity File Number | 001-42268 |
| Entity Registrant Name | ANDRETTI ACQUISITION CORP. II |
| Entity Central Index Key | 0002025341 |
| Entity Tax Identification Number | 98-1792547 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 7615 Zionsville Road |
| Entity Address, City or Town | Indianapolis |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 46268 |
| City Area Code | 317 |
| Local Phone Number | 872-2700 |
| Written Communications | false |
| 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 and one-half of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant |
| Trading Symbol | POLEU |
| 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 | POLE |
| 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 | POLEW |
| Security Exchange Name | NASDAQ |
