Provision (Benefit) for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The Provision (benefit) for income taxes includes:

	Years Ended December 31,
	2016			2015			2014
	(Millions)
Current:
State	$	2		$	(3	)	$	3
Foreign	1			—			1
	3			(3		)	4
Deferred:
State	(1		)	(3		)	8
Foreign	(82		)	7			17
	(83		)	4			25
Provision (benefit) for income taxes	$	(80	)	$	1		$	29

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Reconciliations from the Provision (benefit) at statutory rate to recorded Provision (benefit) for income taxes are as follows:

	Years Ended December 31,
	2016			2015			2014
	(Millions)
Provision (benefit) at statutory rate	$	154		$	(475	)	$	459
Increases (decreases) in taxes resulting from:
Income not subject to U.S. federal tax	(154		)	475			(459		)
State income taxes	1			(6		)	11
Foreign operations — net	(81		)	7			18
Provision (benefit) for income taxes	$	(80	)	$	1		$	29