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Commitments and Contingencies Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Energy Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental loss contingency accrual | $ 11 | $ 6 |
Price of RINs | 190 | 43 | $ 60
Biofuel blending obligation | 214 | 7 |
Metals Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental loss contingency accrual | $ 25 | 27 |
Starfire Holding Corporation |  |  |
Loss Contingencies [Line Items] |  |  |
Ownership percentage by principal owner | 99.60% |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  |
ACF |  |  |
Loss Contingencies [Line Items] |  |  |
Funded status of related party pension plan | 122 |  |
Accrued expenses and other liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental loss contingency accrual | $ 37 | $ 34 |
Icahn Enterprises Holdings |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership interest | 99.00% |  |
Mr. Icahn and affiliates |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership interest | 92.00% |  |
Mr. Icahn and affiliates | Icahn Enterprises G.P. |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership in parent company general partner | 100.00% |  |
Mr. Icahn and affiliates | Icahn Enterprises Holdings |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership interest | 92.00% |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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