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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred Tax Liabilities |  |  |  |
PP&E and intangibles | $ 11,992 | $ 11,100 |  |
Inventory | 46 | 48 |  |
Other | 216 | 190 |  |
Total deferred tax liabilities | 12,254 | 11,338 |  |
Deferred Tax Assets |  |  |  |
Benefit plan accruals | 413 | 450 |  |
Asset retirement obligations and accrued environmental costs | 2,608 | 2,333 |  |
Investments in joint ventures | 2,133 | 1,917 |  |
Other financial accruals and deferrals | 448 | 736 |  |
Loss and credit carryforwards | 5,629 | 6,354 |  |
Other | 121 | 112 |  |
Total deferred tax assets | 11,352 | 11,902 |  |
Less: valuation allowance | (7,656) | (8,049) | $ (8,342) | $ (9,965)
Total deferred tax assets net of valuation allowance | 3,696 | 3,853 |  |
Net deferred tax liabilities | $ 8,558 | $ 7,485 |  |

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