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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Deferred Tax Liabilities |  |  |  |
PP&E and intangibles | $ 11,100 | $ 10,170 |  |
Inventory | 48 | 44 |  |
Other | 190 | 213 |  |
Total deferred tax liabilities | 11,338 | 10,427 |  |
Deferred Tax Assets |  |  |  |
Benefit plan accruals | 450 | 321 |  |
Asset retirement obligations and accrued environmental costs | 2,333 | 2,297 |  |
Investments in joint ventures | 1,917 | 1,684 |  |
Other financial accruals and deferrals | 736 | 827 |  |
Loss and credit carryforwards | 6,354 | 7,402 |  |
Other | 112 | 399 |  |
Total deferred tax assets | 11,902 | 12,930 |  |
Less: valuation allowance | (8,049) | (8,342) | $ (9,965) | $ (10,214)
Total deferred tax assets net of valuation allowance | 3,853 | 4,588 |  |
Net deferred tax liabilities | $ 7,485 | $ 5,839 |  |

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