Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

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			Level 3
		Amount			Value			Inputs		Inputs			Inputs
	(Millions)
September 30, 2016 assets (liabilities):
Cash equivalents		$	1,864		$	1,864		$	1,672	$	192		$	—
Commodity derivatives		$	13		$	13		$	—	$	13		$	—
Commodity derivatives		$	(46	)	$	(46	)	$	—	$	(46	)	$	—
Interest rate derivatives		$	2		$	2		$	—	$	2		$	—
Interest rate derivatives		$	(185	)	$	(185	)	$	—	$	(185	)	$	—
Debt		$	(11,354	)	$	(11,984	)	$	—	$	(11,984	)	$	—
Installment payment		$	(460	)	$	(465	)	$	—	$	(465	)	$	—
Capital lease obligations		$	(11	)	$	(10	)	$	—	$	(10	)	$	—
December 31, 2015 assets (liabilities):
Cash equivalents		$	1,871		$	1,871		$	1,471	$	400		$	—
Commodity derivatives		$	35		$	35		$	—	$	35		$	—
Commodity derivatives		$	(18	)	$	(18	)	$	—	$	(18	)	$	—
Interest rate derivatives		$	2		$	2		$	—	$	2		$	—
Interest rate derivatives		$	(22	)	$	(22	)	$	—	$	(22	)	$	—
Foreign currency derivatives		$	8		$	8		$	—	$	8		$	—
Foreign currency derivatives		$	(8	)	$	(8	)	$	—	$	(8	)	$	—
Debt		$	(13,032	)	$	(11,927	)	$	—	$	(11,927	)	$	—
Capital lease obligations		$	(17	)	$	(16	)	$	—	$	(16	)	$	—