Parent Company (Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Other assets	[1]	$ 30,999	$ 32,202
Total assets		466,679	410,295
Subordinated debt		6,403	6,134
Total liabilities		412,638	360,952
Shareholders’ equity		54,010	49,314
Total liabilities and equity		466,679	410,295
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash held at banking subsidiary		14,882	6
Restricted deposits with banking subsidiary		175	175
Nonrestricted interest-earning deposits			7,024
Net investment held for sale			6,772
Loans with affiliates		1,021	730
Other assets		1,934	1,512
Total assets		65,988	60,155
Subordinated debt		1,010	986
Senior debt		9,567	8,849
Other borrowed funds from affiliates		780	307
Accrued expenses and other liabilities		621	699
Total liabilities		11,978	10,841
Shareholders’ equity		54,010	49,314
Total liabilities and equity		65,988	60,155
Bank Subsidiaries And Bank Holding Company | Parent Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		45,992	41,882
Non Bank Subsidiaries | Parent Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		$ 1,984	$ 2,054

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.2 billion, Loans of $1.4 billion and Other assets of $0.1 billion at December 31, 2020 and Loans held for sale of $1.1 billion, Loans of $0.7 billion and Other assets of $0.1 billion at December 31, 2019.