Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Low-income housing tax credit and other unconsolidated investments	$ 722		$ 169
Right of use assets	366		64
Pension assets	378		289
Accrued interest receivable	286		134
Counterparty receivables	107		0
Fair value of derivative financial instruments	149		3
Nonmarketable equity securities	55		1
Other real estate owned	54		40
Mortgage servicing assets	26	$ 28	23	$ 22	$ 22	$ 18
Federal Home Loan Bank stock	234		40
Income tax receivable	816		799
Other	467		177
Total other assets	$ 3,660		$ 1,739