Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Stock-Based Compensation [Abstract]

Schedule of Stock Based Compensation Expense Table

		Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012		2011
		(In millions)
Total stock-based compensation		$	13	$	9	$	37	$	28
Capitalized in oil and gas properties			(3)		(3)		(10)		(8)
	Net stock-based compensation expense	$	10	$	6	$	27	$	20

Stock Option Activity Table

		Number of Shares Underlying Options	Weighted- Average Exercise Price per Share		Weighted- Average Grant Date Fair Value per Share		Weighted-Average Remaining Contractual Life	Aggregate Intrinsic Value(1)
		(In millions)					(In years)	(In millions)
Outstanding at December 31, 2011		1.1	$	36.31			4.0	$	7
Granted		—		—	$	—
Exercised/Forfeited		(0.1)		20.30					1
Outstanding at September 30, 2012		1.0	$	37.52			3.5	$	2
Exercisable at September 30, 2012		0.9	$	36.61			3.3	$	2
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(1)	The intrinsic value of a stock option is the amount by which the market value of our common stock at the indicated date, or at the time of exercise, exceeds the exercise price of the option.

Restricted Stock and Restricted Stock Unit Activity Table

	Service-Based Shares	Performance/ Market-Based Shares	Total Shares	Weighted-Average Grant Date Fair Value per Share
	(In millions, except per share data)
Non-vested shares outstanding at December 31, 2011	2.2	0.3	2.5	$	49.52
Granted	1.4	0.2	1.6		36.12
Forfeited	(0.2)	—	(0.2)		47.73
Vested	(0.9)	(0.1)	(1.0)		41.80
Non-vested shares outstanding at September 30, 2012	2.5	0.4	2.9	$	44.37