Premises, Equipment, and Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
2022	$ 49
2023	45
2024	40
2025	39
2026	37
2027 and thereafter	238
Total lease payments	448
Less lease liability interest	(62)
Total lease liability	$ 386	$ 411