Derivative Financial Instruments - Schedule of the Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative assets	$ 24,115	$ 14,259
Derivative liabilities	24,362	14,261
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	24,104	14,224
Derivative liabilities	24,228	14,097
Other derivative contracts
Derivatives, Fair Value [Line Items]
Derivative assets		1
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative assets	11	34
Derivative liabilities	16	5
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative assets	23,832	14,201
Derivative liabilities	24,324	14,152
Derivatives not designated as hedging instruments \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	23,832	14,200
Derivative liabilities	24,206	13,993
Derivatives not designated as hedging instruments \| Other derivative contracts
Derivatives, Fair Value [Line Items]
Derivative assets	0	1
Derivative liabilities	118	159
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative assets	283	58
Derivative liabilities	38	109
Derivatives designated as hedging instruments \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	272	24
Derivative liabilities	22	104
Derivatives designated as hedging instruments \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative assets	11	34
Derivative liabilities	$ 16	$ 5