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Debt - Annual Maturities of Total Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 287  
2021 520  
2022 2,546  
2023 2,608  
2024 4,702  
Thereafter 11,396  
Total principal payments 22,059  
Unamortized discount and deferred financing costs (160) $ (29)
Total long-term debt $ 21,899