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Divestitures (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business, net		$ 25	$ 6	$ 456
Net cash received		25	4	(60)
American Express Global Business Travel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial fair value	$ 815
Disposed of by Sale | American Express Global Business Travel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity interest maintained	19.00%
Disposed of by Sale | American Express Global Business Travel | Lodging Agreeement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Supply commitment, term	10 years
American Express Global Business Travel | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business, net		4	6	401
Net cash divested				88
Certain Smaller Business Disposed | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business, net		$ 21	$ 0	57
Net cash received				$ 27

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