Provision (Benefit) for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

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:

	Year Ended December 31,
	2019			2018			2017
	(Millions)
Current:
Federal	$	(41	)	$	(83	)	$	15
State	(5		)	1			23
Foreign	2			—			—
	(44		)	(82		)	38
Deferred:
Federal	280			183			(2,004		)
State	99			37			(8		)
	379			220			(2,012		)
Provision (benefit) for income taxes	$	335		$	138		$	(1,974	)

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:

	Year Ended December 31,
	2019		2018			2017
	(Millions)
Provision (benefit) at statutory rate	$	224	$	69		$	187
Increases (decreases) in taxes resulting from:
Impact of nontaxable noncontrolling interests	29		(73		)	(117		)
Federal Tax Reform rate change	—		—			(1,932		)
State income taxes (net of federal benefit)	74		(10		)	(17		)
State deferred income tax rate change	—		38			26
Foreign operations – net (including tax effect of Canadian Sale)	2		—			(127		)
Federal valuation allowance	3		105			—
Other – net	3		9			6
Provision (benefit) for income taxes	$	335	$	138		$	(1,974	)

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:

	December 31,
	2019		2018
	(Millions)
Deferred income tax liabilities:
Property, plant and equipment	$	1,921	$	2,317
Investments	1,411		295
Other	82		30
Total deferred income tax liabilities	3,414		2,642
Deferred income tax assets:
Accrued liabilities	729		667
Minimum tax credit	29		71
Foreign tax credit	140		140
Federal loss carryovers	544		147
State losses and credits	362		319
Other	147		94
Total deferred income tax assets	1,951		1,438
Less valuation allowance	319		320
Net deferred income tax assets	1,632		1,118
Overall net deferred income tax liabilities	$	1,782	$	1,524

Reconciliation of unrecognized tax benefits [Table Text Block]

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

	2019		2018
	(Millions)
Balance at beginning of period	$	51	$	50
Additions for tax positions of prior years	—		1
Balance at end of period	$	51	$	51