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Debt - Repayments of long-term debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 299
2019 0
2020 600
2021 400
2022 0
Thereafter 4,770
Total Repayments 6,069
Unamortized discount, premium, and debt issuance cost (103)
Total Debt $ 5,966