Premises, Equipment, and Leases - Lease Expense and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease cost
Operating lease cost	$ 47	$ 48	$ 39
Sublease income	(2)	(1)	(1)
Total lease cost	45	47	38
Other information
(Gain) loss on right-of-use asset impairment - operating leases	1	3	6
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	50	53	41
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	31	19	216
Finance leases	$ 0	$ 0	$ 2