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Debt - Schedule of Annual Estimated Debt Service Requirements (Details)
$ in Millions
Sep. 30, 2019
USD ($)
interest_rate_swap_agreement
Annual maturities of long-term debt  
Remaining 2019 $ 16
2020 64
2021 64
2022 64
2023 64
Thereafter 8,406
Total 8,678
Total debt service obligation  
Remaining 2019 176
2020 504
2021 484
2022 454
2023 434
Thereafter 8,866
Total $ 10,918
Designated as hedging instrument  
Total debt service obligation  
Number of interest rate derivatives | interest_rate_swap_agreement 10
Estimated interest payments  
Estimated interest payments  
Remaining 2019 $ 160
2020 440
2021 420
2022 390
2023 370
Thereafter 460
Total $ 2,240