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Leases - Maturity Analysis of Operating Lease Liabilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Maturity of Operating Lease Liabilities  
2019 $ 25
2020 144
2021 144
2022 140
2023 138
Thereafter 361
Total future operating lease payments 952
Less - imputed interest (171)
Total operating lease liabilities $ 781