Basis of Presentation (Details) ft² in Thousands, $ in Millions			3 Months Ended		9 Months Ended
	Sep. 29, 2026 USD ($)	Jan. 12, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Feb. 25, 2026 USD ($) ft²
Disposal Group, Including Discontinued Operations [Line Items]
Gain on sale of equity investment			$ 982	$ 0	$ 982	$ 0
Headquarters at 200 Greenwich Street
Disposal Group, Including Discontinued Operations [Line Items]
Contractual obligation (up to)							$ 2,800
Finance lease, liability							370
Finance lease, right-of-use asset, before accumulated amortization							$ 370
Headquarters at 200 Greenwich Street | Property Under Construction
Disposal Group, Including Discontinued Operations [Line Items]
Area of real estate property | ft²							1,950
ICS | Interest Acquired in Swisscard AECS GmbH
Disposal Group, Including Discontinued Operations [Line Items]
Intangible assets acquired, excluding goodwill		$ 272
Acquired finite-lived intangible assets, weighted average useful life					8 years
Goodwill acquired during period		$ 136
GBTG
Disposal Group, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage, sold	30.00%
Gain on sale of equity investment	$ 982
Gain on sale of equity investment, after tax	$ 751