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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
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
2016
 
2015
 
2016
 
2015
Income tax expense (benefit)
$
(314
)
 
$
77

 
$
(697
)
 
$
(1,315
)
Income (loss) before income taxes
(925
)
 
185

 
(2,306
)
 
(4,443
)
Effective tax rate
34
%
 
42
%
 
30
%
 
30
%