Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning Balance at Dec. 31, 2011	$ 7,757	$ 5	$ (877)	$ 6,990	$ (316)	$ 1,955
Beginning Balance (in shares) at Dec. 31, 2011		455
Net income (loss)	(39)					(39)
Other comprehensive income (loss)	77				77
Exercise of common stock options (in shares)		4
Exercise of common stock options	8			8
Repurchase of common stock (in shares)		(5)
Repurchase of common stock	(960)		(960)
Excess tax benefits from stock-based compensation	429			429
Stock-based compensation and issuance of employee benefit plan stock	854			854
Issuance of common stock for acquisition activity	66			66
Ending Balance at Dec. 31, 2012	8,192	5	(1,837)	8,347	(239)	1,916
Ending Balance (in shares) at Dec. 31, 2012		454
Net income (loss)	274					274
Other comprehensive income (loss)	54				54
Exercise of common stock options (in shares)		5
Exercise of common stock options	4			4
Repurchase of common stock (in shares)		0
Repurchase of common stock	0		0
Excess tax benefits from stock-based compensation	73			73
Stock-based compensation and issuance of employee benefit plan stock	1,149			1,149
Ending Balance at Dec. 31, 2013	9,746	5	(1,837)	9,573	(185)	2,190
Ending Balance (in shares) at Dec. 31, 2013		459
Net income (loss)	(241)					(241)
Other comprehensive income (loss)	(326)				(326)
Exercise of common stock options (in shares)		6
Exercise of common stock options	2			2
Excess tax benefits from stock-based compensation	6			6
Stock-based compensation and issuance of employee benefit plan stock	1,510			1,510
Ending Balance at Dec. 31, 2014	$ 10,741	$ 5	$ (1,837)	$ 11,135	$ (511)	$ 1,949
Ending Balance (in shares) at Dec. 31, 2014		465