CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, at Cost	Non-controlling Interests
Balance, value at Dec. 31, 2012	$ 4,186	$ 2	$ 2,371	$ 4,690	$ 14	$ (2,914)	$ 23
Balance, shares at Dec. 31, 2012		158
Net income	318			301			17
Other comprehensive loss, net of tax	(27)				(27)
Dividends declared	(93)			(93)
Distributions to noncontrolling interests	(13)						(13)
Issuance of common stock under benefit plans, value	10		1			9
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	17		15			2
Exercise of stock options, value	63		(5)			68
Exercise of stock options, shares		1
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(10)		(10)
Purchases of treasury stock, value	(512)		(45)			(467)
Purchases of treasury stock, shares		(8.0)
Balance, value at Jun. 30, 2013	3,939	2	2,327	4,898	(13)	(3,302)	27
Balance, shares at Jun. 30, 2013		152
Balance, value at Dec. 31, 2013	3,973	2	2,379	5,358	(8)	(3,783)	25
Balance, shares at Dec. 31, 2013		144
Net income	253			237			16
Other comprehensive loss, net of tax	0
Dividends declared	(95)			(95)
Distributions to noncontrolling interests	(14)						(14)
Issuance of common stock under benefit plans, value	9					9
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	25		23			2
Exercise of stock options, value	30		(3)			33
Exercise of stock options, shares
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(5)		(5)
Purchases of treasury stock, value	(57)					(57)
Purchases of treasury stock, shares		(1.0)
Balance, value at Jun. 30, 2014	$ 4,119	$ 2	$ 2,394	$ 5,500	$ (8)	$ (3,796)	$ 27
Balance, shares at Jun. 30, 2014		144