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Leases - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Weighted Average Remaining Lease Term 5 years 2 months 12 days 5 years 3 months 18 days
Rental expense $ 38 $ 36
Cash paid related to operating lease liabilities $ 38 $ 36
Weighted Average Discount Rate 3.50% 3.80%
Acquired right-of-use assets in exchange for new operating lease liabilities $ 16 $ 118