Provision (Benefit) for Income Taxes (Tables)

6 Months Ended

Jun. 30, 2021

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  June 30,				Six Months Ended  June 30,
	2021		2020		2021		2020
	(Millions)
Current:
Federal	$	—	$	—	$	(2)	$	(28)
State	1		(1)		—		—
	1		(1)		(2)		(28)
Deferred:
Federal	85		93		200		(41)
State	33		25		62		(18)
	118		118		262		(59)
Provision (benefit) for income taxes	$	119	$	117	$	260	$	(87)