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]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock [Member] Common Stock [Member]	Series E Preferred Stock [Member] Preferred Stock [Member]	Series E Preferred Stock [Member] Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period at Dec. 31, 2012	$ 20,985		$ 725	$ 550	$ 9,174	$ 10,817		$ (590)		$ 309
Common Stock, Shares, Outstanding, beginning of period at Dec. 31, 2012				539,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	1,344					1,344
Other Comprehensive Income (Loss), Net of Tax	(598)									(598)
Noncontrolling Interest, Period Increase (Decrease)	5							5
Dividends, Common Stock, Cash	(188)					(188)
Dividends, Preferred Stock, Cash	(37)					(37)	[2]
Treasury Stock, Shares, Acquired											(5,000)
Treasury Stock, Value, Acquired, Cost Method	(150)							(150)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period											1,000
Stock Issued During Period, Value, Stock Options Exercised	16				(27)			43
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				(35)	0		39
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	32							32
Stock Issued During Period, Shares, Employee Benefit Plan											0
Stock Issued During Period, Value, Employee Benefit Plan	9				3			6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period at Dec. 31, 2013	21,422		725	$ 550	9,115	11,936		(615)		(289)
Common Stock, Shares, Outstanding, end of period at Dec. 31, 2013				536,000
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	(42)					(42)	[2]
Stock Issued During Period, Value, New Issues	496											$ 500	$ (4)
Treasury Stock, Shares, Acquired											(12,000)
Treasury Stock, Value, Acquired, Cost Method	(458)							(458)
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
Stock Issued During Period, Shares, Employee Benefit Plan											0
Stock Issued During Period, Value, Employee Benefit Plan	3				(1)			4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	(39)				(23)			(16)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period at Dec. 31, 2014	$ 23,005		1,225	$ 550	9,089	13,295		(1,032)		(122)
Common Stock, Shares, Outstanding, end of period at Dec. 31, 2014	524,540	[3]		525,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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	(64)					(64)	[2]
Treasury Stock, Shares, Acquired											(17,000)
Treasury Stock, Value, Acquired, Cost Method	(679)							(679)
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, Shares, Employee Benefit Plan											0
Stock Issued During Period, Value, Employee Benefit Plan	3				0			3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period at Dec. 31, 2015	$ 23,437		$ 1,225	$ 550	$ 9,094	$ 14,686		$ (1,658)		$ (460)
Common Stock, Shares, Outstanding, end of period at Dec. 31, 2015	508,712	[3]		509,000

[1] 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.At December 31, 2014, includes ($1,119) million for treasury stock, ($21) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.At December 31, 2013, includes ($684) million for treasury stock, ($50) million for the compensation element of restricted stock, and $119 million for noncontrolling interest.

[2] 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. For the year ended December 31, 2014, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, and $5,875 per share for Perpetual Preferred Stock Series E. For the year ended December 31, 2013, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, and $5,793 per share for Perpetual Preferred Stock Series E.

[3] Includes restricted shares of 1,334 thousand and 2,930 thousand at December 31, 2015 and December 31, 2014, respectively.