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	732			706			26
Other comprehensive loss, net of tax	(22)				(22)
Dividends declared	(137)			(137)
Distributions to noncontrolling interests	(21)						(21)
Issuance of common stock under benefit plans, value	16		2			14
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	24		21			3
Exercise of stock options, value	98		(7)			105
Exercise of stock options, shares		2
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(10)		(10)
Tax benefits associated with stock-based compensation plans	(1)		(1)
Purchases of treasury stock, value	(994)		(70)			(924)
Purchases of treasury stock, shares		(16.0)
Other	1						1
Balance, value at Sep. 30, 2013	3,872	2	2,306	5,259	(8)	(3,716)	29
Balance, shares at Sep. 30, 2013		145
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	392			366			26
Other comprehensive loss, net of tax	(7)				(7)
Dividends declared	(143)			(143)
Distributions to noncontrolling interests	(23)						(23)
Issuance of common stock under benefit plans, value	14		1			13
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	38		36			2
Exercise of stock options, value	55		(3)			58
Exercise of stock options, shares		1
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(6)		(6)
Tax benefits associated with stock-based compensation plans	(1)		(1)
Purchases of treasury stock, value	(82)					(82)
Purchases of treasury stock, shares		(1.0)
Balance, value at Sep. 30, 2014	$ 4,210	$ 2	$ 2,406	$ 5,581	$ (15)	$ (3,792)	$ 28
Balance, shares at Sep. 30, 2014		145