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Leases - Maturities of lease liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
2019 (excluding the six months ended June 30, 2019) $ 87 $ 193
2020 124 154
2021 100 118
2022 78 91
2023 58 66
2024 and thereafter 266 283
Total operating lease payments 713 $ 905
Less: imputed interest 167  
Present value of lease liabilities $ 546