Derivative Financial Instruments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative
Amount of variation margin payment applied to derivative asset contracts	$ 587,000,000	$ 1,000,000,000
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts	7,000,000	9,000,000
Amount of variation margin payment applied to derivative liability contracts	$ 721,000,000	1,000,000,000
Maximum length of time of hedging exposure	97 months
Gain or losses reclassified from AOCI into earnings associated with the discontinuance of cash flow hedges	$ 0	0
Notional amount of the risk participations agreements	3,563,000,000	3,710,000,000
Interest rate contracts
Derivative
Deferred losses, net of tax, on cash flow hedges recorded in accumulated other comprehensive income	372,000,000	498,000,000
Net deferred losses, net of tax, recorded in AOCI are expected to be reclassified into earnings	135,000,000
Interest rate contracts | Credit Risk
Derivative
Fair value of risk participation agreements	$ 6,000,000	7,000,000
Weighted-average remaining life	2 years 9 months 18 days
Total collateral
Derivative
Derivative assets	$ 1,300,000,000	1,300,000,000
Derivative liabilities	$ 1,100,000,000	$ 913,000,000