Derivative Financial Instruments - Schedule of the Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative assets	$ 24,906	$ 14,259
Derivative liabilities	25,577	14,261
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	24,890	14,224
Derivative liabilities	25,416	14,097
Other derivative contracts
Derivatives, Fair Value [Line Items]
Derivative assets		1
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative assets	16	34
Derivative liabilities	32	5
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative assets	24,627	14,201
Derivative liabilities	25,502	14,152
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	24,627	14,200
Derivative liabilities	25,373	13,993
Derivatives not designated as hedging instruments | Other derivative contracts
Derivatives, Fair Value [Line Items]
Derivative assets	0	1
Derivative liabilities	129	159
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative assets	279	58
Derivative liabilities	75	109
Derivatives designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	263	24
Derivative liabilities	43	104
Derivatives designated as hedging instruments | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative assets	16	34
Derivative liabilities	$ 32	$ 5