Parent Company (Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Other assets	[1]	$ 32,202	$ 34,408
Total assets		410,295	382,315
Subordinated debt		6,134	5,895
Total liabilities		360,952	334,545
Shareholders’ equity		49,314	47,728
Total liabilities and equity		410,295	382,315
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash held at banking subsidiary		6	6
Restricted deposits with banking subsidiary		175	175
Nonrestricted interest-earning deposits		7,024	4,655
Loans with affiliates		730	1,397
Other assets		1,512	1,159
Total assets		60,155	55,141
Subordinated debt		986	1,652
Senior debt (a)		8,849	5,061
Other borrowed funds from affiliates		307	79
Accrued expenses and other liabilities		699	619
Total liabilities		10,841	7,411
Shareholders’ equity		49,314	47,730
Total liabilities and equity		60,155	55,141
Parent Company | Bank Subsidiaries And Bank Holding Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		48,654	45,863
Parent Company | Non Bank Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		$ 2,054	$ 1,886

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.1 billion, Loans of $.7 billion, and Other assets of $.1 billion at December 31, 2019 and Loans held for sale of $.9 billion, Loans of $.8 billion, and Other assets of $.2 billion at December 31, 2018.