Derivatives - Gains/(Losses) on Derivatives Associated with Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains expected to be reclassified to earnings in the next twelve months			$ 20
Hedging Instruments And Hedged Items
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses), cash flow hedges	$ (103)	$ 0	(149)	$ (1)
Gain (loss) reclassified from AOCI into interest income	4	(1)	7	(4)
Hedging Instruments And Hedged Items | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses), cash flow hedges	$ (138)	$ (6)	$ (105)	$ (20)