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	144			136			8
Other comprehensive loss, net of tax	(4)				(4)
Dividends declared	(47)			(47)
Distributions to noncontrolling interests	(3)						(3)
Issuance of common stock under benefit plans, value	5		1			4
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	5		4			1
Exercise of stock options, value	14		(1)			15
Exercise of stock options, shares
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(9)		(9)
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares
Tax benefits associated with stock-based compensation plans	(1)		(1)
Purchases of treasury stock, value	(62)					(62)
Purchases of treasury stock, shares		(1.0)
Balance, value at Mar. 31, 2013	4,228	2	2,365	4,779	10	(2,956)	28
Balance, shares at Mar. 31, 2013		158
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	111			104			7
Other comprehensive loss, net of tax	(3)				(3)
Dividends declared	(47)			(47)
Distributions to noncontrolling interests	(3)						(3)
Issuance of common stock under benefit plans, value	5					5
Issuance of common stock under benefit plans, shares		1
Stock-based compensation expense	12		11			1
Exercise of stock options, value	12		(2)			14
Exercise of stock options, shares
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value	(5)		(5)
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares
Tax benefits associated with stock-based compensation plans	(2)		(2)
Purchases of treasury stock, value	(32)					(32)
Purchases of treasury stock, shares		(1.0)
Other	(1)						(1)
Balance, value at Mar. 31, 2014	$ 4,020	$ 2	$ 2,381	$ 5,415	$ (11)	$ (3,795)	$ 28
Balance, shares at Mar. 31, 2014		144