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Leases - Maturities of lease liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
2019 (excluding the nine months ended September 30, 2019) $ 38 $ 193
2020 128 154
2021 98 118
2022 73 91
2023 51 66
2024 and thereafter 253 283
Total operating lease payments 641 $ 905
Less: imputed interest 131  
Present value of lease liabilities $ 510