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Acquisitions and Divestitures - Future Amortization Expense (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Business Acquisition [Line Items] |
2019 | $ 70
2020 | 75
2021 | 75
2022 | 73
Acreage Dedication Contracts | Alpha Holding Company, LLC |
Business Acquisition [Line Items] |
2019 | 34
2020 | 42
2021 | 48
2022 | $ 54

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