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Leases - Maturities of lease liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
2021 $ 137  
2022 119  
2023 91  
2024 73  
2025 and thereafter 302  
Total operating lease payments 722  
Less: imputed interest 127  
Present value of lease liabilities $ 595 $ 553