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Debt - Repayments of long-term debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
2017 $ 336
2018 278
2019 0
2020 600
2021 400
Thereafter 4,700
Total Repayments 6,314
Unamortized discount, premium, and debt issuance cost (109)
Long-term Debt $ 6,205