Other Assets - Components of Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Affordable housing tax credit and other unconsolidated investments	$ 1,869	$ 762
Right of use assets for operating leases, net	337	345
Pension assets	359	343
Accrued interest receivable	772	329
Income tax receivable	284	275
Federal Home Loan Bank stock	393	197
Fair value of derivative financial instruments	547	159
Bank-owned life insurance	530	586
Counterparty receivables	171	98
Nonmarketable equity securities	62	58
Other real estate owned	46	47
Mortgage servicing assets	25	25
Other	2,055	1,145
Total other assets	7,450	4,369
Other Assets, Miscellaneous
Other Assets [Line Items]
Bank owned life insurance, amount terminated but not cash-settled	$ 428	$ 607