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Leases - Maturities of lease liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
2019 (excluding the three months ended March 31, 2019) $ 108 $ 193
2020 115 154
2021 91 118
2022 71 91
2023 50 66
After 2024 253 283
Total operating lease payments 688 $ 905
Less: imputed interest 150  
Present value of lease liabilities $ 538