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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)