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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
millions except percentages
2017
 
2016
Income tax expense (benefit)
$
97

 
$
(383
)
Income (loss) before income taxes
(178
)
 
(1,381
)
Effective tax rate
(54
)%
 
28
%