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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit) The income tax (benefit) expense consists of the following:
 
Three Months Ended March 31,
(millions, except percentages)
2018
 
2017
Current
$
126

 
$
12

Deferred
(157
)
 

Total Income Tax (Benefit) Expense
$
(31
)
 
$
12

Effective Tax Rate
(5.7
)%
 
20.3
%