Employee Benefits and Expenses, Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Other noninterest expense	$ 1,006	$ 1,023	$ 2,893	$ 3,228
Operating losses	2,218	540	3,467	1,056
Regulatory charges and assessments expense, including FDIC assessment expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Other noninterest expense	207	$ 213	$ 640	$ 622
Litigation, customer remediation, and regulatory matters [Member]
Defined Benefit Plan Disclosure [Line Items]
Operating losses	$ 2,000