Provision (Benefit) for Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

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

The Provision (benefit) for income taxes includes:

	Three Months Ended   March 31,
	2018			2017
	(Millions)
Current:
Federal	$	(19	)	$	3
State	1			6
	(18		)	9
Deferred:
Federal	64			15
State	9			13
	73			28
Provision (benefit) for income taxes	$	55		$	37