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Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Derivative
Collateral held for derivative assets	$ 421,000,000		$ 421,000,000		$ 947,000,000
Amount of variation margin payment applied to derivative asset contracts	(324,000,000)		(324,000,000)		(403,000,000)
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts	7,000,000		7,000,000		4,000,000
Amount of variation margin payment applied to derivative liability contracts	549,000,000		549,000,000		1,200,000,000
Gain or losses reclassified from AOCI into earnings associated with the discontinuance of cash flow hedges	0	$ 0	0	$ 0
Total collateral
Derivative
Collateral held for derivative liabilities	1,200,000,000		$ 1,200,000,000		1,100,000,000
Interest rate contracts
Derivative
Maximum length of time of hedging exposure			79 months
Deferred loss, net of tax, on cash flow hedges recorded in accumulated other comprehensive income	271,000,000		$ 271,000,000		654,000,000
Net deferred loss, net of tax, recorded in AOCI are expected to be reclassified into earnings	108,000,000		108,000,000
Interest rate contracts \| Credit Risk
Derivative
Notional amount of the risk participations agreements	3,000,000,000.0		3,000,000,000.0		3,200,000,000
Fair value of risk participation agreements	$ 4,000,000		$ 4,000,000		$ 5,000,000