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Acquisitions and Dispositions - Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]  
2018 $ 63
2019 68
2020 74
2021 75
2022 76
Acreage Dedication Contracts | Alpha Holding Company, LLC  
Business Acquisition [Line Items]  
2018 25
2019 34
2020 42
2021 48
2022 $ 54