Other Assets - Components of Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Affordable housing tax credit and other unconsolidated investments	$ 2,010	$ 762
Right of use assets for operating leases, net	360	345
Pension assets	359	343
Accrued interest receivable	732	329
Income tax receivable	208	275
Federal Home Loan Bank stock	119	197
Fair value of derivative financial instruments	758	159
Bank-owned life insurance	104	586
Counterparty receivables	113	98
Nonmarketable equity securities	58	58
Other real estate owned	62	47
Mortgage servicing rights	25	25
Other	861	1,145
Total other assets	$ 5,769	4,369
Other Assets, Miscellaneous
Other Assets [Line Items]
Bank owned life insurance, amount terminated but not cash-settled		$ 607