Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule Of Carrying Value And Fair Value Measurement Information For Financial Assets And Liabilities

							Fair Value Measurements Using:
	Carrying			Total Fair			Level 1		Level 2
	Amount			Value			Inputs		Inputs
June 30, 2018 assets (liabilities):
Cash equivalents	$	321		$	321		$	321	$	—
Commodity derivatives	$	240		$	240		$	—	$	240
Commodity derivatives	$	(740	)	$	(740	)	$	—	$	(740	)
Interest rate derivatives	$	1		$	1		$	—	$	1
Interest rate derivatives	$	(1	)	$	(1	)	$	—	$	(1	)
Debt	$	(6,067	)	$	(6,572	)	$	—	$	(6,572	)
December 31, 2017 assets (liabilities):
Cash equivalents	$	1,533		$	1,533		$	1,454	$	79
Commodity derivatives	$	205		$	205		$	—	$	205
Commodity derivatives	$	(286	)	$	(286	)	$	—	$	(286	)
Interest rate derivatives	$	1		$	1		$	—	$	1
Interest rate derivatives	$	(64	)	$	(64	)	$	—	$	(64	)
Debt	$	(6,864	)	$	(8,131	)	$	—	$	(8,131	)