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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit)
Income tax expense (benefit) consists of the following:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(millions, except percentages)
2019
 
2018
 
2019
 
2018
Current
$
21

 
$
23

 
$
37

 
$
149

Deferred
(1
)
 
(7
)
 
(101
)
 
(164
)
Total Income Tax Expense (Benefit)
$
20

 
$
16

 
$
(64
)
 
$
(15
)
Effective Tax Rate
71.4
%
 
160.0
%
 
18.6
%
 
(2.7
)%