Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following table presents the Company's assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2014 for each of the fair value hierarchy levels:

	Fair Value Measurement at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at March 31, 2014
	(in millions)
Recurring fair value measurements
Assets:
Commodity derivatives	$	—	$	95	$	—	$	95
Interest rate derivatives	—		10		—		10
Deferred compensation plan assets	67		—		—		67
Total assets	67		105		—		172
Liabilities:
Commodity derivatives	—		42		—		42
Interest rate derivatives	—		4		—		4
Total liabilities	—		46		—		46
Total recurring fair value measurements	$	67	$	59	$	—	$	126

Fair Value of Assets Classified as Held for Sale [Table Text Block]

The following table presents the estimated fair value less costs to sell as of March 31, 2014 and fair value adjustments for the Company's assets classified as discontinued operations held for sale for the three months ended March 31, 2014:

	Estimated Fair Value Less Costs to Sell		Fair Value Adjustment
	(in millions)
Alaska	$	253	$	(97	)
Barnett Shale field	$	208	$	(14	)

Schedule of carrying values and financial instruments not carried at fair value

Carrying values and fair values of financial instruments that are not carried at fair value in the consolidated balance sheets as of March 31, 2014 and December 31, 2013 are as follows:

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Long-term debt	$	2,706	$	3,121	$	2,653	$	3,019