Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Credit Derivatives [Line Items]
Derivative assets after effects of bilateral collateral and master netting agreements	$ 6
Derivative liabilities after effects of bilateral collateral and master netting agreements	4
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	250
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	(1,600)
Reclassify of after-tax net losses on derivative instruments from AOCI	$ 640
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 6 months 7 days
Cash collateral netted against derivative assets	$ 328	$ 10
Collateral netted against derivative liabilities	112	626
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	613
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	25
Default reserve associated with uncollateralized contracts	11
Gross exposure on derivatives after taking into account effects of master netting agreements	344
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve	231
Net liability position	$ 1	$ 2