v3.26.1

Cover - shares	6 Months Ended
Cover - shares	Jun. 30, 2026	Jul. 31, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2026
Document Transition Report	false
Entity File Number	001-39576
Entity Registrant Name	Global Business Travel Group, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-0598290
Entity Address, Address Line One	666 3rd Avenue, 4th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	646
Local Phone Number	344-1290
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	GBTG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		522,373,443
Amendment Flag	false
Document Fiscal Year Focus	2026
Entity Central Index Key	0001820872
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2

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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Local phone number for entity.

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Title of a 12(b) registered security.

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Global Business Travel Group, Inc. 10-Q