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Income Taxes (Tables)
 9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
millions except percentages
2016
 
2015
 
2016
 
2015
Income tax expense (benefit)
$
(260
)
 
$
(917
)
 
$
(957
)
 
$
(2,232
)
Income (loss) before income taxes
(1,007
)
 
(3,077
)
 
(3,313
)
 
(7,520
)
Effective tax rate
26
%
 
30
%
 
29
%
 
30
%