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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of income tax provision (benefit)
Income tax (benefit) expense consists of the following:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(millions, except percentages)
2020
 
2019
 
2020
 
2019
Current
$
7

 
$
21

 
$
44

 
$
37

Deferred
(96
)
 
(1
)
 
(144
)
 
(101
)
Total Income Tax (Benefit) Expense
$
(89
)
 
$
20

 
$
(100
)
 
$
(64
)
Effective Tax Rate
18.7
%
 
71.4
%
 
2.2
%
 
18.6
%