Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis (in millions)

	Fair Value Measurements at
	September 30, 2014 Using
Description	Level 1		Level 2		Level 3		Netting and Collateral			(a)	Total Fair Value
Assets:
Commodity derivatives	$	580	$	110	$	—	$	(631	)		$	59
Liabilities:
Commodity derivatives	$	601	$	172	$	—	$	(655	)		$	118

	Fair Value Measurements at
	December 31, 2013 Using
Description	Level 1		Level 2		Level 3		Netting and Collateral			(a)	Total Fair Value
Assets:
Commodity derivatives	$	185	$	195	$	—	$	(329	)		$	51
Liabilities:
Commodity derivatives	$	199	$	223	$	—	$	(364	)		$	58

(a) Represents the impact of netting assets, liabilities and collateral when a legal right of offset exists.