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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]  
Income Tax Provision (Benefit)
The income tax provision relating to continuing operations consists of the following:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(millions)
2015
 
2014
 
2015
 
2014
Current
$
99

 
$
34

 
$
109

 
$
94

Deferred
(283
)
 
7

 
(312
)
 
24

Total Income Tax (Benefit) Provision
$
(184
)
 
$
41

 
$
(203
)
 
$
118

Effective Tax Rate
62.8
%
 
17.6
%
 
60.8
%
 
23.1
%