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Income Taxes - Components of deferred tax liabilties and assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 02, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred Tax Liabilities |  |  |
Properties, plants and equipment, and intangibles | $ 8,660 |  | $ 8,004
Inventory | 35 |  | 60
Deferred state income tax | 0 |  | 61
Other | 234 |  | 156
Total deferred tax liabilities | 8,929 |  | 8,281
Deferred Tax Assets |  |  |
Benefit plan accruals | 542 |  | 641
Asset retirement obligations and accrued environmental costs | 2,339 |  | 2,891
Investments in joint ventures (Asset) | 1,722 |  | 104
Other financial accruals and deferrals | 777 |  | 330
Loss and credit carryforwards | 8,968 |  | 2,378
Other | 345 |  | 398
Total deferred tax assets | 14,693 |  | 6,742
Less valuation allowance | (10,214) |  | (3,040)
Net deferred tax assets | 4,479 | $ 151 | 3,702
Total deferred tax liabilities | $ 4,450 |  | $ 4,579

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