Provision (Benefit) for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Expense (Benefit), Continuing Operations [Abstract]

Schedule of Components of Provision (benefit) for income taxes [Table Text Block]

The Provision (benefit) for income taxes includes:

	Years Ended December 31,
	2018			2017			2016
	(Millions)
Current:
Federal	$	(83	)	$	15		$	—
State	1			23			2
Foreign	—			—			(1		)
	(82		)	38			1
Deferred:
Federal	183			(2,004		)	(6		)
State	37			(8		)	61
Foreign	—			—			(81		)
	220			(2,012		)	(26		)
Provision (benefit) for income taxes	$	138		$	(1,974	)	$	(25	)

Provision for income taxes at federal statutory rate [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,
	2018			2017			2016
	(Millions)
Provision (benefit) at statutory rate	$	69		$	187		$	(131	)
Increases (decreases) in taxes resulting from:
Impact of nontaxable noncontrolling interests	(73		)	(117		)	(22		)
Federal Tax Reform rate change	—			(1,932		)	—
State income taxes (net of federal benefit)	(10		)	(17		)	3
State deferred income tax rate change	38			26			43
Foreign operations – net (including tax effect of Canadian Sale)	—			(127		)	78
Valuation allowance	105			—			—
Translation adjustment of certain unrecognized tax benefits	—			—			(1		)
Other – net	9			6			5
Provision (benefit) for income taxes	$	138		$	(1,974	)	$	(25	)

Deferred tax liabilities and Deferred tax assets [Table Text Block]

Significant components of Deferred income tax liabilities and Deferred income tax assets are as follows. Following the WPZ Merger, the attributes below are presented based on the underlying assets.

	December 31,
	2018		2017
	(Millions)
Deferred income tax liabilities:
Property, plant and equipment	$	2,317	$	—
Investments	295		3,565
Other	30		19
Total deferred income tax liabilities	2,642		3,584
Deferred income tax assets:
Accrued liabilities	667		53
Minimum tax credit	71		155
Foreign tax credit	140		140
Federal loss carryovers	147		—
State losses and credits	319		283
Other	94		30
Total deferred income tax assets	1,438		661
Less valuation allowance	320		224
Net deferred income tax assets	1,118		437
Overall net deferred income tax liabilities	$	1,524	$	3,147

Reconciliation of unrecognized tax benefits [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2018		2017
	(Millions)
Balance at beginning of period	$	50	$	50
Additions for tax positions of prior years	1		—
Balance at end of period	$	51	$	50