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Income Taxes Effects of Temporary Differences That Comprise Net Deffered Income Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:      
Net operating losses and alternative minimum tax credit $ 683 $ 472  
Pension and other postretirement benefits 21 30  
Long-term debt 14 32  
Other 191 182  
Deferred Tax Assets, Gross 909 716  
Valuation allowance (189) (118)  
Net deferred income tax assets 720 598  
Deferred income tax liabilities:      
Property, plant and equipment (1,036) (1,633)  
Investments in unconsolidated affiliates (2,726) (3,789)  
Trademarks (173) (273)  
Other (100) (15)  
Deferred Tax Liabilities, Gross 4,035 5,710  
Deferred Tax Liabilities $ (3,315) $ (5,112) $ (4,590)