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					536,000
Total shareholders' equity at Dec. 31, 2013		$ 21,422		$ 725	$ 550	$ 9,115		$ 11,936	$ (615)		$ (289)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent		1,774						1,774
Other Comprehensive Income (Loss), Net of Tax		167									167
Noncontrolling Interest, Period Increase (Decrease)		5							5
Dividends, Common Stock, Cash		(371)						(371)
Dividends, Preferred Stock, Cash	[2]	(42)						(42)
Stock Issued During Period, Value, New Issues		(496)		(500)		(4)
Treasury Stock, Shares, Acquired					(12,000)
Treasury Stock, Value, Acquired, Cost Method		(458)							(458)
Payments for Repurchase of Warrants		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		(4)				(16)			(20)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		17				18		(2)	1
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		27							27
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		(39)				23			16
Stock Issued During Period, Value, Employee Benefit Plan		3				(1)			4
Total shareholders' equity at Dec. 31, 2014		23,005		1,225	$ 550	9,089		13,295	(1,032)		(122)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding					525,000
Net Income (Loss) Attributable to Parent		1,933						1,933
Other Comprehensive Income (Loss), Net of Tax		(338)									(338)
Dividends, Common Stock, Cash		(475)						(475)
Dividends, Preferred Stock, Cash	[2]	(64)						(64)
Treasury Stock, Shares, Acquired					(17,000)
Treasury Stock, Value, Acquired, Cost Method		(679)							(679)
Payments for Repurchase of Warrants		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		(12)				(18)			(30)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		24				23		(3)	4
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		16							16
Stock Issued During Period, Value, Employee Benefit Plan		3				0			3
Total shareholders' equity at Dec. 31, 2015		$ 23,437		1,225	$ 550	9,094		14,686	(1,658)		(460)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		508,712	[3]		509,000
Cumulative effect of credit risk adjustment	[4]	$ 0						5			(5)	[5]
Net Income (Loss) Attributable to Parent		1,878						1,878
Other Comprehensive Income (Loss), Net of Tax		(356)									(356)
Noncontrolling Interest, Period Increase (Decrease)		(5)							(5)
Dividends, Common Stock, Cash		(498)						(498)
Dividends, Preferred Stock, Cash	[2]	(66)						(66)
Treasury Stock, Shares, Acquired					(20,000)
Treasury Stock, Value, Acquired, Cost Method		(806)							(806)
Payments for Repurchase of Warrants		(24)				(24)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		(25)	[6]			(40)	[6]		(65)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		31	[6]			(20)	[6]	(5)	56
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		2							2
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]
Common Stock, Shares, Outstanding		491,188	[3]		491,000

[1] At December 31, 2016, includes ($2,448) million for treasury stock, ($1) million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At December 31, 2015, includes ($1,764) million for treasury stock, ($2) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.

[2] For the year ended December 31, 2016, dividends were $4,067 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, and $5,625 per share for Perpetual Preferred Stock Series F.For the year ended December 31, 2015, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, and $6,219 per share for Perpetual Preferred Stock Series F.

[3] Includes restricted shares of 11 thousand and 1,334 thousand at December 31, 2016 and December 31, 2015, respectively.

[4] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk, beginning January 1, 2016. See Note 1, "Significant Accounting Policies," and Note 21, "Accumulated Other Comprehensive (Loss)/Income," for additional information.

[5] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," for additional information.

[6] Includes a ($4) million net reclassification of excess tax benefits from additional paid-in capital to provision for income taxes, related to the Company's early adoption of ASU 2016-09. See Note 1, "Significant Accounting Policies," and Note 15, "Employee Benefit Plans," for additional information.