Goodwill, Other Intangibles, and Property and Equipment - Components of Depreciation and Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Depreciation And Amortization By Type [Line Items]
Depreciation and amortization	$ 2,775	$ 3,035	$ 2,937
Internal-use software
Depreciation And Amortization By Type [Line Items]
Depreciation and amortization	1,021	1,216	1,068
Other property and equipment
Depreciation And Amortization By Type [Line Items]
Depreciation and amortization	248	260	251
Value of business acquired (reported in Other assets)
Depreciation And Amortization By Type [Line Items]
Depreciation and amortization	0	7	12
Other intangibles
Depreciation And Amortization By Type [Line Items]
Depreciation and amortization	$ 1,506	$ 1,552	$ 1,606