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Acquisitions and Divestitures - Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]  
2020 $ 77
2021 73
2022 74
Acreage Dedication Contracts | Alpha Holding Company, LLC  
Business Acquisition [Line Items]  
2020 42
2021 48
2022 $ 54