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Provision (Benefit) for Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
 
(Millions)
Current:
 
 
 
 
 
 
 
Federal
$
—

 
$
—

 
$
3

 
$
—

State
2

 
—

 
8

 
—

Foreign
—

 
(1
)
 
—

 
(1
)
 
2

 
(1
)
 
11

 
(1
)
Deferred:
 
 
 
 
 
 
 
Federal
59

 
(52
)
 
74

 
(57
)
State
4

 
(18
)
 
17

 
(11
)
Foreign
—

 
(74
)
 
—

 
(74
)
 
63

 
(144
)
 
91

 
(142
)
Provision (benefit) for income taxes
$
65

 
$
(145
)
 
$
102

 
$
(143
)