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Provision (Benefit) for Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2020
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,
 
2020
 
2019
 
(Millions)
Current:
 
 
 
Federal
$
(28
)
 
$
(6
)
State
1

 
—

 
(27
)
 
(6
)
Deferred:
 
 
 
Federal
(134
)
 
61

State
(43
)
 
14

 
(177
)
 
75

Provision (benefit) for income taxes
$
(204
)
 
$
69