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Income Taxes Effects of Temporary Differences That Comprise Net Deffered Income Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Net operating losses, alternative minimum tax credit and other carryforwards $ 768 $ 683
Pension and other postretirement benefits 34 21
Long-term debt 13 14
Other 181 191
Deferred Tax Assets, Gross 996 909
Valuation allowance (96) (189)
Net deferred income tax assets 900 720
Deferred income tax liabilities:    
Property, plant and equipment (782) (1,036)
Investments in unconsolidated affiliates (2,872) (2,726)
Trademarks (63) (173)
Other (109) (100)
Deferred Tax Liabilities, Gross 3,826 4,035
Deferred Tax Liabilities $ (2,926) $ (3,315)