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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit) The income tax (benefit) expense consists of the following:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(millions, except percentages)
2018
 
2017
 
2018
 
2017
Current
$
23

 
$
37

 
$
149

 
$
49

Deferred
(7
)
 
(873
)
 
(164
)
 
(873
)
Total Income Tax Expense (Benefit)
$
16

 
$
(836
)
 
$
(15
)
 
$
(824
)
Effective Tax Rate
160.0
%
 
35.8
%
 
(2.7
)%
 
36.2
%