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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit) Income tax expense (benefit) consists of the following:
 
Three Months Ended March 31,
(millions, except percentages)
2019
 
2018
Current
$
16

 
$
126

Deferred
(100
)
 
(157
)
Total Income Tax Benefit
$
(84
)
 
$
(31
)
Effective Tax Rate
22.5
%
 
(5.7
)%