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Commitments and Contingencies - Minimum lease obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leases Future Minimum Payments Due  
2019 $ 170
2020 158
2021 142
2022 126
2023 110
Thereafter 784
Total 1,490
Operating Leases Future Minimum Receipts  
2019 59
2020 48
2021 35
2022 23
2023 10
Thereafter 7
Total $ 182