Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Common Stock	AOCI
Balance at Dec. 31, 2013		$ 1,741	$ 1,211	$ 28,173	$ (19,790)	$ (528)
Net income	$ 2,821	0	0	2,821	0	0
Dividends declared and paid ($1.24, $1.40 and $1.64 per share in 2014, 2015, and 2016)		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 compensation		0	277	0	0	0
Excess tax benefit for stock compensation		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)
Net income	2,986	0	0	2,986	0	0
Dividends declared and paid ($1.24, $1.40 and $1.64 per share in 2014, 2015, and 2016)		0	0	(1,444)	0	0
Common stock issued for stock-based awards		0	(116)	0	513	0
Stock repurchases		0	0	0	(2,741)	0
Stock compensation		0	286	0	0	0
Excess tax benefit for stock compensation		0	90	0	0	0
Other comprehensive income (loss), net of taxes	0	0	0	0	0	0
Dividend equivalents paid on restricted stock units		0	0	(19)	0	0
Other		0	1	0	0	0
Balance at Dec. 31, 2015	9,946	1,741	1,629	31,176	(24,068)	(532)
Net income	3,595	0	0	3,595	0	0
Dividends declared and paid ($1.24, $1.40 and $1.64 per share in 2014, 2015, and 2016)		0	0	(1,646)	0	0
Common stock issued for stock-based awards		0	(204)	0	677	0
Stock repurchases		0	0	0	(2,132)	0
Stock compensation		0	252	0	0	0
Other comprehensive income (loss), net of taxes	6	0	0	0	0	6
Dividend equivalents paid on restricted stock units		0	0	(18)	0	0
Other		0	(3)	0	0	0
Balance at Dec. 31, 2016	$ 10,473	$ 1,741	$ 1,674	$ 33,107	$ (25,523)	$ (526)