Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Credit Derivatives [Line Items]
Derivative assets after effects of bilateral collateral and master netting agreements	$ 15
Derivative liabilities after effects of bilateral collateral and master netting agreements	(38)
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	382
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	1,300
Reclassify of after-tax net gains on derivative instruments from AOCI	$ (609)
Length of time hedge in cash flow hedge (in months)	12 months
Reclassification of net losses related to terminated cash flow hedges from AOCI to income	$ (3)
Maximum length of time over which forecasted transactions are hedged (in years)	4 years 9 months 3 days
Cash collateral netted against derivative assets	$ (289)	$ (10)
Collateral netted against derivative liabilities	161	626
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	632
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	41
Default reserve associated with uncollateralized contracts	15
Gross exposure on derivatives after taking into account effects of master netting agreements	495
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve	356
Net liability position totaled	$ 2	$ 2