Derivatives - Schedule of Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities (Details) - Customer Interest Rate Contracts Hedging - Hedging Instruments And Hedged Items - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses) related to interest rate derivatives	$ 195	$ (744)	$ (268)
Offsetting upstream interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses) related to interest rate derivatives	$ (195)	$ 744	$ 268