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Income Tax - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 48 $ 38 $ 333
Additions based on tax positions related to the current year 1 7 43
Additions based on acquisitions related to the current year   5  
Additions for tax positions of prior years 1 1 8
Reduction for tax positions of prior years (2) (1) (310)
Settlements (1) (2) (18)
Foreign currency translation 1   (18)
Balance at end of year $ 48 $ 48 $ 38