| Document and Entity Information | Jan. 10, 2022 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | Austerlitz Acquisition Corp II |
| Amendment Flag | false |
| Entity Central Index Key | 0001839191 |
| Document Type | 8-K |
| Document Period End Date | Jan. 10, 2022 |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 001-40112 |
| Entity Tax Identification Number | 98-1583275 |
| Entity Address, Address Line One | 1701 Village Center Circle |
| Entity Address, City or Town | Las Vegas |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89134 |
| City Area Code | (702) |
| Local Phone Number | 323-7330 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Units Each Consisting Of One Class A Ordinary Share And One Fourth Of One Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one Class A Ordinary Share and one-fourth of one Warrant |
| Trading Symbol | ASZ.U |
| Security Exchange Name | NYSE |
| Class A Redeemable Ordinary Shares [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Ordinary Shares, par value $0.0001 per share |
| Trading Symbol | ASZ |
| Security Exchange Name | NYSE |
| Warrants Each Whole Warrant Exercisable For One Class A Ordinary Share At An Exercise Price Of 11.50 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants, each whole Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share |
| Trading Symbol | ASZ WS |
| Security Exchange Name | NYSE |
