Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Millions, $ in Millions		Total	Common Stock		Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2012		$ (2,131)			$ 14,069	$ (7,389)	$ (8,577)	$ (234)
Beginning balance, shares at Dec. 31, 2012			868					16
Consolidated Statements of Stockholders' Equity (Deficit)
Net income		10,540				10,540
Dividends declared		(102)				(102)
Other comprehensive income		3,447					3,447
Shares of common stock issued and compensation expense associated with equity awards and other, value	[1]	66			90			$ (24)
Shares of common stock issued and compensation expense associated with equity awards and other, shares			5	[1]				2
Stock options exercised, value		73			73
Stock options exercised, shares			6
Stock purchased and retired, value		(250)			(250)
Stock purchased and retired, shares			(10)
Ending balance at Dec. 31, 2013		11,643			13,982	3,049	(5,130)	$ (258)
Ending balance, shares at Dec. 31, 2013			869					18
Consolidated Statements of Stockholders' Equity (Deficit)
Net income		659				659
Dividends declared		(252)				(252)
Other comprehensive income		(2,181)					(2,181)
Shares of common stock issued and compensation expense associated with equity awards and other, value	[1]	26			81			$ (55)
Shares of common stock issued and compensation expense associated with equity awards and other, shares	[1]		3					2
Stock options exercised, value		18			18
Stock options exercised, shares			2
Stock purchased and retired, value		(1,100)			(1,100)
Stock purchased and retired, shares			(29)
Ending balance at Dec. 31, 2014		8,813			12,981	3,456	(7,311)	$ (313)
Ending balance, shares at Dec. 31, 2014			845					20
Consolidated Statements of Stockholders' Equity (Deficit)
Net income		4,526				4,526
Dividends declared		(359)				(359)
Other comprehensive income		36					36
Shares of common stock issued and compensation expense associated with equity awards and other, value	[1]	16			76			$ (60)
Shares of common stock issued and compensation expense associated with equity awards and other, shares	[1]		1					1
Stock options exercised, value		18			18
Stock options exercised, shares			2
Stock purchased and retired, value		(2,200)			(2,200)
Stock purchased and retired, shares			(48)
Ending balance at Dec. 31, 2015		$ 10,850			$ 10,875	$ 7,623	$ (7,275)	$ (373)
Ending balance, shares at Dec. 31, 2015			800					21

[1] Weighted average price per share