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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Deferred Tax Liabilities |  |  |  |
PP&E and intangibles | $ 15,609 | $ 11,992 |  |
Inventory | 91 | 46 |  |
Other | 155 | 216 |  |
Total deferred tax liabilities | 15,855 | 12,254 |  |
Deferred Tax Assets |  |  |  |
Benefit plan accruals | 432 | 413 |  |
Asset retirement obligations and accrued environmental costs | 2,799 | 2,608 |  |
Investments in joint ventures | 2,269 | 2,133 |  |
Other financial accruals and deferrals | 497 | 448 |  |
Loss and credit carryforwards | 4,910 | 5,629 |  |
Other | 187 | 121 |  |
Total deferred tax assets | 11,094 | 11,352 |  |
Less: valuation allowance | (6,435) | (7,656) | $ (8,049) | $ (8,342)
Total deferred tax assets net of valuation allowance | 4,659 | 3,696 |  |
Net deferred tax liabilities | $ 11,196 | $ 8,558 |  |

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