Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Federal Home Loan Bank stock	$ 39	$ 40
Tax credit investments and investments in non-consolidated entities	702	156
Counterparty receivables	106	0
Fair value of derivative financial instruments	110	0
Right of use assets	384	64
Pension assets	297	289
Income taxes receivable	834	799
Other real estate owned	43	40
Servicing asset	28	23	$ 23	$ 18
Accrued interest receivable	247	134
Other	540	194
Other assets	$ 3,330	$ 1,739