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v3.20.4

Summary of Significant Accounting Policies - Turnaround Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Petroleum Segment |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Amortization period | 4 years |  |
Turnaround costs capitalized | $ 155 | $ 38 | $ 8
Petroleum Segment | Minimum |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Frequency of planned major maintenance activities | 4 years |  |
Petroleum Segment | Maximum |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Frequency of planned major maintenance activities | 5 years |  |
Nitrogen Fertilizer Segment |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Turnaround expenses incurred | $ 1 | $ 10 | $ 6
Nitrogen Fertilizer Segment | Minimum |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Frequency of planned major maintenance activities | 2 years |  |
Nitrogen Fertilizer Segment | Maximum |  |  |
Planned Major Maintenance Activities [Line Items] |  |  |
Frequency of planned major maintenance activities | 3 years |  |

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- Definition Capitalized Costs, Turnaround Costs + References No definition available. + Details
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- Definition Planned Major Maintenance Activities, Amortization Period + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition Turnaround Costs + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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