Derivative and Hedging Activities - Net Gain (Loss) Recognized in Income on Derivative Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Derivative gain (loss)	$ 11
Net Return (loss) on Mortgage Servicing Rights | Futures
Derivative [Line Items]
Derivative gain (loss)	(1)
Net Return (loss) on Mortgage Servicing Rights | Interest Rate Swaps and Swaptions
Derivative [Line Items]
Derivative gain (loss)	(11)
Net Return (loss) on Mortgage Servicing Rights | Mortgage-backed Securities Forwards
Derivative [Line Items]
Derivative gain (loss)	(4)
Net gain on loan sales | Rate Lock Commitments and US Treasury Futures
Derivative [Line Items]
Derivative gain (loss)	28
Other non interest income | Forward Commitments
Derivative [Line Items]
Derivative gain (loss)	$ (1)