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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Schedule of Income Taxes and Effective Tax Rate
The following summarizes income tax expense (benefit) and effective tax rates:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
millions except percentages
2017
 
2016
 
2017
 
2016
Current income tax expense (benefit)
$
(522
)
 
$
103

 
$
240

 
$
148

Deferred income tax expense (benefit)
484

 
(417
)
 
(181
)
 
(845
)
Total income tax expense (benefit)
$
(38
)
 
$
(314
)
 
$
59

 
$
(697
)
Income (loss) before income taxes
(372
)
 
(925
)
 
(550
)
 
(2,306
)
Effective tax rate
10
%
 
34
%
 
(11
)%
 
30
%