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Property, Plant, and Equipment - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 plant | Sep. 30, 2020 plant | Sep. 30, 2021 USD ($) plant | Sep. 30, 2020 USD ($) plant | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 plant | Dec. 31, 2019 plant
Ethanol Plants, Jefferson, Wisconsin [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment (Textual) |  |  |  |  |  |  |  |
Number of ethanol plants with reduced estimated useful life | 1 |  |  |  |  |  |  |
Additional depreciation expense | $ |  |  | $ 48 |  | $ 48 |  |  |
Number of ethanol plants temporarily idled |  |  |  |  |  |  | 1 |
Number of ethanol plants ceased operations |  |  | 1 |  |  |  |  |
Ethanol Plants, Riga, Michigan [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment (Textual) |  |  |  |  |  |  |  |
Number of ethanol plants with reduced estimated useful life |  | 1 |  |  |  |  |  |
Additional depreciation expense | $ |  |  |  | $ 30 |  | $ 30 |  |
Number of ethanol plants temporarily idled |  |  |  |  |  |  |  | 1
Number of ethanol plants ceased operations |  |  |  | 1 |  |  |  |

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