Derivatives - Gains/(Losses) on Derivatives Associated with Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains expected to be reclassified to earnings in the next twelve months			$ 7
Hedging Instruments And Hedged Items
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses), cash flow hedges	$ (25)	$ 0	(45)	$ (1)
Gain (loss) reclassified from AOCI into interest income	3	(2)	2	(3)
Hedging Instruments And Hedged Items | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses), cash flow hedges	$ 37	$ (6)	$ 69	$ (14)