Derivative Financial Instruments - Schedule of The Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 15,187	$ 25,944
Fair value of derivative liabilities	16,126	26,126
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	15,185	25,943
Fair value of derivative liabilities	15,825	25,927
Interest rate contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	2	1
Fair value of derivative liabilities	0	42
Derivatives not designated as hedging instruments | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	15,126	25,939
Derivatives not designated as hedging instruments | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	16,091	25,968
Derivatives not designated as hedging instruments | Foreign exchange contracts | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	15,126	25,939
Derivatives not designated as hedging instruments | Foreign exchange contracts | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	15,790	25,811
Derivatives not designated as hedging instruments | Other derivative contracts | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0	0
Derivatives not designated as hedging instruments | Other derivative contracts | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	301	157
Derivatives designated as hedging instruments | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	61	5
Derivatives designated as hedging instruments | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	35	158
Derivatives designated as hedging instruments | Foreign exchange contracts | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	59	4
Derivatives designated as hedging instruments | Foreign exchange contracts | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	35	116
Derivatives designated as hedging instruments | Interest rate contracts | Derivative Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	2	1
Derivatives designated as hedging instruments | Interest rate contracts | Derivative Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 0	$ 42