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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Taxes [Line Items]          
Income tax provision (benefit) $ 19 $ (50) $ 26 $ (410)  
Earnings (loss) before income taxes 70 $ (223) (309) (919)  
Net benefit included in tax provision relating to the adjustment of certain tax reserves       $ 31  
Unrecognized tax benefits 74   74   $ 74
Total amount of unrecognized tax benefits that, if recognized, would affect effective tax rate 10   10   12
Accrued liabilities, interest on unrecognized tax benefits $ 5   5   1
Domestic Country          
Income Taxes [Line Items]          
Deferred tax asset, valuation allowance         $ 804
Change in deferred tax assets     $ 32