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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Effective tax rate 26.30% 33.90% 15.10% 29.70%
Deferred tax liability $ 19   $ 19