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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
Balance beginning $ 109 $ 82 $ 71
Additions based on tax positions related to the current year 6 19 19
Additions based on tax positions of prior years 12 11 4
Accrued interest 2 4 2
Reductions for tax positions of prior years     (7)
Settlements (88) (1)  
Lapse of statute of limitations (5) (6) (7)
Balance ending 36 109 82
Net unrecognized tax benefits that would impact effective tax rate 31    
Accrual for unrecognized tax benefits $ 0 $ 0 $ 0