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Income Taxes Effects of Temporary Differences That Comprise Net Deffered Income Tax Liability (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Net operating losses, alternative minimum tax credit and other carryforwards | $ 1,047 | $ 936
Pension and other postretirement benefits | 0 | 7
Other | 34 | 85
Deferred Tax Assets, Gross | 1,081 | 1,028
Valuation allowance | (134) | (95)
Net deferred income tax assets | 947 | 933
Deferred income tax liabilities: |  |
Property, plant and equipment | (298) | (501)
Investments in affiliates | (3,994) | (3,547)
Trademarks | (77) | (72)
Other | (6) | (21)
Deferred Tax Liabilities, Gross | 4,375 | 4,141
Deferred Tax Liabilities | $ (3,428) | $ (3,208)

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