Derivative Financial Instruments - Summary of Derivative Activity and Related Impact on Consolidated Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	$ (193)	$ (52)	$ 82
Interest rate risks | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	56	62	50
Interest rate risks | Derivatives designated as hedging instruments | Amounts reclassified from AOCI into income | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	56	63	50
Interest rate risks | Derivatives designated as hedging instruments | Change in fair value of interest rate swaps hedging investment securities | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	387	138	0
Interest rate risks | Derivatives designated as hedging instruments | Change in fair value of hedged investment securities | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	(387)	(139)	0
Currency exchange risks | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	(10)	0	(1)
Currency exchange risks | Derivatives not designated as hedging instruments | Gains (losses) on revaluations of internal foreign currency instruments, net | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	(42)	(43)	39
Currency exchange risks | Derivatives not designated as hedging instruments | Gains (losses) on client foreign exchange forward contracts, net | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	32	43	(40)
Other derivative instruments | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	13	0	0
Other derivative instruments | Derivatives not designated as hedging instruments | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	5	2	28
Other derivative instruments | Derivatives not designated as hedging instruments | Gains (losses) on revaluations of internal foreign currency instruments, net | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	23	17	3
Other derivative instruments | Derivatives not designated as hedging instruments | Gains (losses) on client foreign exchange forward contracts, net | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	(10)	(17)	(3)
Total return swaps | Derivatives not designated as hedging instruments | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	40	0	0
Equity warrant assets | Derivatives not designated as hedging instruments | Gains on equity warrant assets, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) on derivatives	$ 148	$ 560	$ 237