Commitments (Other Commitments) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Commitments	$ 275,464	$ 277,172
Liability Related To Investments In Low Income Housing Tax Credits	2,000	2,200
Commitments to extend credit
Other Commitments [Line Items]
Commitments	259,828	261,728
Commitments to extend credit | Commercial
Other Commitments [Line Items]
Commitments	194,702	198,542
Commitments to extend credit | Home equity
Other Commitments [Line Items]
Commitments	23,668	22,783
Commitments to extend credit | Credit card
Other Commitments [Line Items]
Commitments	33,835	33,066
Commitments to extend credit | Other
Other Commitments [Line Items]
Commitments	7,623	7,337
Standby letters of credit
Other Commitments [Line Items]
Commitments	11,017	10,575
Standby letters of credit | Remarketing Programs
Other Commitments [Line Items]
Commitments	3,900	3,600
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,193	1,208
Other commitments
Other Commitments [Line Items]
Commitments	$ 3,426	$ 3,661