Consolidated Statements of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Common Stock	AOCI
Balance at Dec. 31, 2011		$ 1,741	$ 1,194	$ 26,278	$ (17,485)	$ (776)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,759	0	0	1,759	0	0
Dividends declared and paid		0	0	(819)	0	0
Common stock issued for stock-based awards		0	(337)	0	823	0
Stock repurchases		0	0	0	(1,800)	0
Stock-based compensation		0	263	0	0	0
Tax impact from exercise of options	133	0	56	0	0	0
Other comprehensive income (loss), net of taxes	77	0	0	0	0	77
Dividend equivalents paid on restricted stock units		0	0	(13)	0	0
Balance at Dec. 31, 2012		1,741	1,176	27,205	(18,462)	(699)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,162	0	0	2,162	0	0
Dividends declared and paid		0	0	(1,175)	0	0
Common stock issued for stock-based awards		0	(273)	0	1,540	0
Stock repurchases		0	0	0	(2,868)	0
Stock-based compensation		0	287	0	0	0
Tax impact from exercise of options	227	0	25	0	0	0
Other comprehensive income (loss), net of taxes	171	0	0	0	0	171
Dividend equivalents paid on restricted stock units		0	0	(19)	0	0
Other		0	(4)	0	0	0
Balance at Dec. 31, 2013		1,741	1,211	28,173	(19,790)	(528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,821	0	0	2,821	0	0
Dividends declared and paid		0	0	(1,323)	0	0
Common stock issued for stock-based awards		0	(226)	0	781	0
Stock repurchases		0	0	0	(2,831)	0
Stock-based compensation		0	277	0	0	0
Tax impact from exercise of options	218	0	110	0	0	0
Other comprehensive income (loss), net of taxes	(4)	0	0	0	0	(4)
Dividend equivalents paid on restricted stock units		0	0	(18)	0	0
Other		0	(4)	0	0	0
Balance at Dec. 31, 2014		$ 1,741	$ 1,368	$ 29,653	$ (21,840)	$ (532)