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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Taxes [Line Items]          
Income taxes expense (benefit) $ (26) $ (494) $ (56) $ (462)  
Income taxes percentage on pre-tax income (loss) 12.00%        
Pre-tax income (loss) $ (213) $ 119 $ 791 $ (5,171)  
Provisional estimate for one-time deemed repatriation tax liability         $ 112
Provision for income tax $ 40        
Israel Tax Authority [Member]          
Income Taxes [Line Items]          
Statutory Israeli corporate tax rate     23.00%