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Basis of Presentation - Credit loss adoption (Detail) - USD ($)
$ in Millions
6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Adoption of new accounting standard   $ (2)      
Allowance for doubtful accounts   46 $ 28 $ 28 $ 29
Accounting Standards Update 2016-13 [Member] | Adjustment [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Adoption of new accounting standard $ (2)        
Allowance for doubtful accounts $ (1) $ (1)