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Leases - Financing Obligation Service Requirements (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Other Commitments [Line Items]  
2020 $ 733
2021 813
2022 828
2023 847
2024 867
Thereafter 33,151
Total 37,239
Financing obligations - principal  
Other Commitments [Line Items]  
2020 21
2021 26
2022 29
2023 33
2024 37
Thereafter 8,468
Total 8,614
Financing obligations - interest  
Other Commitments [Line Items]  
2020 712
2021 787
2022 799
2023 814
2024 830
Thereafter 24,683
Total $ 28,625