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Debt - Schedule of Annual Maturities, Excluding Amortization of Debt Issuance Costs (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 18  
2022 16  
2023 15  
2024 15  
2025 15  
Thereafter 1,364  
Total $ 1,443 $ 1,214