Debt (Tables)

6 Months Ended

Jun. 30, 2012

Debt Instruments [Abstract]

Debt

			June 30, 2012		December 31, 2011
			(In millions)
Senior unsecured debt:
	Revolving credit facility ― LIBOR based loans		$	—	$	85
	Money market lines of credit(1)			—		1
		Total credit arrangements		—		86
	5¾% Senior Notes due 2022			750		750
	5⅝% Senior Notes due 2024			1,000		—
		Total senior unsecured debt		1,750		836
6⅝% Senior Subordinated Notes due 2014				—		325
6⅝% Senior Subordinated Notes due 2016				550		550
7⅛% Senior Subordinated Notes due 2018				600		600
6⅞% Senior Subordinated Notes due 2020				695		695
		Total long-term debt	$	3,595	$	3,006
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(1)		Because capacity under our credit facility was available to repay borrowings under our money market lines of credit as of the indicated dates, amounts outstanding under these obligations, if any, are classified as long-term.