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Debt - Repayments of long-term debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Debt Disclosure [Abstract]  
2020 $ 712
2021 400
2022 500
2023 350
2024 600
Thereafter 4,882
Total Repayments 7,444
Unamortized discounts, premiums, and debt issuance costs (105)
Total Debt $ 7,339