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Revenue - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2018 $ 565
Billings (591)
Revenue recognized 661
Currency translation adjustments and other (20)
Balance at September 30, 2019 615
Balance at December 31, 2018 458
Billings 548
Revenue recognized (560)
Currency translation adjustments and other 9
Balance at September 30, 2019 $ 455