Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Accounts receivable	$ 939		$ 862
Low-income housing tax credit and other unconsolidated investments	696		160
Right of use assets	378		64
Pension assets	303		289
Accrued interest receivable	258		134
Counterparty receivables	90		0
Fair value of derivative financial instruments	80		3
Non-marketable equity securities	69		10
Other real estate owned	45		40
Mortgage servicing assets	28	$ 28	23	$ 22	$ 23	$ 18
Federal Home Loan Bank stock	83		40
Other	370		114
Total other assets	3,339		1,739
Income taxes receivable	$ 843		$ 799