| Document and Entity Information | Dec. 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 09, 2022 |
| Entity File Number | 001-39576 |
| Entity Registrant Name | Global Business Travel Group, Inc. |
| Entity Central Index Key | 0001820872 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 98-0598290 |
| Entity Address, Address Line One | 666 3rd Avenue |
| Entity Address, Address Line Two | 4th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10017 |
| City Area Code | 480 |
| Local Phone Number | 909-1740 |
| Title of 12(b) Security | Class A common stock, par value of $0.0001 per share |
| Trading Symbol | GBTG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
