Parent Company (Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Other assets	[1]	$ 34,408	$ 27,894
Total assets		382,315	380,768
Subordinated debt		5,895	5,200
Total liabilities		334,545	333,183
Shareholders’ equity		47,728	47,513
Total liabilities and equity		382,315	380,768
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash held at banking subsidiary		6	1
Restricted deposits with banking subsidiary		175	175
Nonrestricted interest-earning deposits		4,655	5,800
Loans with affiliates		1,397	1,244
Other assets		1,159	1,243
Total assets		55,141	55,221
Subordinated debt		1,652	1,645
Senior debt (a)		5,061	5,203
Commercial Paper			100
Other borrowed funds from affiliates		79	108
Accrued expenses and other liabilities		619	652
Total liabilities		7,411	7,708
Shareholders’ equity		47,730	47,513
Total liabilities and equity		55,141	55,221
Parent Company | Bank Subsidiaries And Bank Holding Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		45,863	44,360
Parent Company | Non Bank Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries		$ 1,886	$ 2,398

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $.9 billion, Loans of $.8 billion, and Other assets of $.2 billion at December 31, 2018 and Loans held for sale of $1.7 billion, Loans of $.9 billion, and Other assets of $.3 billion at December 31, 2017.