Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions		Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock and Other	[1]	AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding					491,000
Total shareholders' equity at Dec. 31, 2016		$ 23,618		$ 1,225	$ 550	$ 9,010	$ 16,000	$ (2,346)		$ (821)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent		468	[2],[3]				468
Other Comprehensive Income (Loss), Net of Tax		(46)								(46)
Noncontrolling Interest, Period Increase (Decrease)		(2)						(2)
Dividends, Common Stock, Cash		(128)					(128)
Dividends, Preferred Stock, Cash	[4]	(17)					(17)
Treasury Stock, Shares, Acquired					(7,000)
Treasury Stock, Value, Acquired, Cost Method		(414)						(414)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		9				12		21
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(4)				(32)	(1)	29
Total shareholders' equity at Mar. 31, 2017		$ 23,484		1,225	$ 550	8,966	16,322	(2,712)		(867)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding					486,000
Common Stock, Shares, Outstanding		470,931	[5]		471,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	[6]	$ (10)					144			(154)	[7]
Total shareholders' equity at Dec. 31, 2017		25,154		$ 2,475	$ 550	9,000	17,540	(3,591)		(820)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent		643					643
Other Comprehensive Income (Loss), Net of Tax		(548)								(548)
Noncontrolling Interest, Period Increase (Decrease)		(2)						(2)
Dividends, Common Stock, Cash		(187)					(187)
Dividends, Preferred Stock, Cash	[4]	(31)					(31)
Treasury Stock, Shares, Acquired					(5,000)
Treasury Stock, Value, Acquired, Cost Method		(330)						(330)
Stock Redeemed or Called During Period, Shares				(450,000)
Stock Redeemed or Called During Period, Value		(450)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		32				0		32
Stock Issued During Period, Shares, Other					2,000
Stock Issued During Period, Value, Other		2			$ 2
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(4)				(40)	(2)	38
Total shareholders' equity at Mar. 31, 2018		$ 24,269		$ 2,025	$ 552	$ 8,960	$ 18,107	$ (3,853)		$ (1,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		469,708	[5]		470,000

[1] At March 31, 2018, includes ($3,953) million for treasury stock, less than ($1) million for the compensation element of restricted stock, and $101 million for noncontrolling interest.At March 31, 2017, includes ($2,812) million for treasury stock, less than ($1) million for the compensation element of restricted stock, and $101 million for noncontrolling interest.

[2] Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the three months ended March 31, 2017 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

[3] During the fourth quarter of 2017, the Company sold PAC, the results of which were previously reported within the Wholesale business segment. For all periods prior to January 1, 2018, PAC's financial results, including the gain on sale, have been transferred to Corporate Other for enhanced comparability of the Wholesale business segment excluding PAC.

[4] For the three months ended March 31, 2018, dividends were $1,000 per share for both Series A and B Preferred Stock, $1,469 per share for Series E Preferred Stock, $1,406 per share for Series F Preferred Stock, $1,038 per share for Series G Preferred Stock, and $1,281 per share for Series H Preferred Stock.For the three months ended March 31, 2017, dividends were $1,000 per share for both Series A and B Preferred Stock, $1,469 per share for Series E Preferred Stock, and $1,406 per share for Series F Preferred Stock.

[5] Includes restricted shares of 9 thousand and 9 thousand at March 31, 2018 and December 31, 2017, respectively.

[6] Related to the Company's adoption of ASU 2014-09, ASU 2016-01, ASU 2017-12, and ASU 2018-02 on January 1, 2018. See Note 1, "Significant Accounting Policies," for additional information.

[7] Related to the Company's adoption of ASU 2018-02 on January 1, 2018. See Note 1, "Significant Accounting Policies," for additional information.