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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit)
Income tax expense (benefit) consists of the following:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(millions, except percentages)
2019
 
2018
 
2019
 
2018
Current
$
24

 
$
45

 
$
61

 
$
194

Deferred
(9
)
 
14

 
(110
)
 
(150
)
Total Income Tax Expense (Benefit)
$
15

 
$
59

 
$
(49
)
 
$
44

Effective Tax Rate
29.4
%
 
19.2
%
 
16.7
%
 
5.1
%