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Provision (Benefit) for Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 
June 30,
 
Six Months Ended 
June 30,
 
2020
 
2019
 
2020
 
2019
 
(Millions)
Current:
 
 
 
 
 
 
 
Federal
$
—

 
$
(9
)
 
$
(28
)
 
$
(15
)
State
(1
)
 
—

 
—

 
—

 
(1
)
 
(9
)
 
(28
)
 
(15
)
Deferred:
 
 
 
 
 
 
 
Federal
93

 
91

 
(41
)
 
152

State
25

 
16

 
(18
)
 
30

 
118

 
107

 
(59
)
 
182

Provision (benefit) for income taxes
$
117

 
$
98

 
$
(87
)
 
$
167