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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit) The income tax expense (benefit) consists of the following:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(millions, except percentages)
2018
 
2017
 
2018
 
2017
Current
$
45

 
$
22

 
$
194

 
$
71

Deferred
14

 
(115
)
 
(150
)
 
(988
)
Total Income Tax Expense (Benefit)
$
59

 
$
(93
)
 
$
44

 
$
(917
)
Effective Tax Rate
19.2
%
 
44.7
%
 
5.1
%
 
36.9
%