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Leases and Capacity Purchase Agreements - Future Lease Payment under Terms of Capacity Purchase Agreement (Details)
$ in Billions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 2.9
2021 2.9
2022 2.4
2023 1.5
2024 1.3
After 2024 4.7
Total $ 15.7