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Provision (Benefit) for Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Provision (benefit) for income taxes [Table Text Block]
The Provision (benefit) for income taxes includes:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
 
(Millions)
Current:
 
 
 
 
 
 
 
State
$
1

 
$
1

 
$
1

 
$
1

Foreign
—

 
—

 
—

 
—

 
1

 
1

 
1

 
1

Deferred:
 
 
 
 
 
 
 
State
(6
)
 
(7
)
 
(4
)
 
(6
)
Foreign
(75
)
 
6

 
(76
)
 
8

 
(81
)
 
(1
)
 
(80
)
 
2

 
 
 
 
 
 
 
 
Provision (benefit) for income taxes
$
(80
)
 
$
—

 
$
(79
)
 
$
3