Derivative Financial Instruments - Net Gain (Loss) Recognized in Income on Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Derivative gain (loss)	$ (160)	$ (150)	$ (95)	$ (52)
Futures | Net return on mortgage servicing rights
Derivative [Line Items]
Derivative gain (loss)	1	0	4	0
Interest rate swaps and swaptions | Net return on mortgage servicing rights
Derivative [Line Items]
Derivative gain (loss)	(35)	20	(48)	(27)
Mortgage-backed securities forwards | Net return on mortgage servicing rights
Derivative [Line Items]
Derivative gain (loss)	(8)	7	(39)	(11)
Rate lock commitments and MSR forwards | Net gain on loan sales
Derivative [Line Items]
Derivative gain (loss)	(116)	(178)	(12)	(15)
Forward commitments | Other noninterest income
Derivative [Line Items]
Derivative gain (loss)	(3)	0	(3)	0
Interest rate swaps | Other noninterest income
Derivative [Line Items]
Derivative gain (loss)	$ 1	$ 1	$ 3	$ 1