Consolidated Statements Of Stockholders' Equity (USD $) In Millions, except Share data in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2011	$ 8,063	$ 32	$ 1,938	$ 6,825	$ 303	$ (1,035)
Balances, issued shares at Dec. 31, 2011		193,230
Net income	1,222			1,222
Other comprehensive income	83				83
Common stock repurchases	(518)					(518)
Dividends declared	(166)		0	(166)
Stock-based compensation	82		82
Restricted stock grants and restricted stock unit vesting	0	0
Restricted stock grants and restricted stock unit vesting, issued shares		15
Restricted stock forfeitures	0	0	0
Restricted stock forfeitures, issued shares		(1)
Stock option exercises	60	0	60
Stock option exercises, issued shares		1,227
Stock option and restricted stock tax benefit	21		21
Balance at Dec. 31, 2012	8,847	32	2,101	7,881	386	(1,553)
Balances, issued shares at Dec. 31, 2012		194,471
Net income	1,231			1,231
Other comprehensive income	(228)				(228)
Common stock repurchases	(531)					(531)
Dividends declared	(170)		0	(170)
Stock-based compensation	92		92
Restricted stock grants and restricted stock unit vesting	0	0
Restricted stock grants and restricted stock unit vesting, issued shares		563
Stock option exercises	67	1	66
Stock option exercises, issued shares		1,242
Stock option and restricted stock tax benefit	8		8
Balance at Dec. 31, 2013	9,316	33	2,267	8,942	158	(2,084)
Balances, issued shares at Dec. 31, 2013		196,276
Net income	1,147			1,147
Other comprehensive income	65				65
Common stock repurchases	(872)		(100)			(772)
Dividends declared	(173)		0	(173)
Stock-based compensation	98		98
Restricted stock grants and restricted stock unit vesting	0	0
Restricted stock grants and restricted stock unit vesting, issued shares		966
Stock option exercises	52	0	52
Stock option exercises, issued shares	715	710
Stock option and restricted stock tax benefit	13		13
Balance at Dec. 31, 2014	$ 9,646	$ 33	$ 2,330	$ 9,916	$ 223	$ (2,856)
Balances, issued shares at Dec. 31, 2014		197,952