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Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities    
Property, plant, and equipment $ 1,079 $ 1,612
Equity in earnings of affiliates 91 361
Debt exchange 83 132
Inventories 4 41
Other 79 105
Deferred Tax Liabilities, Gross 1,336 2,251
Deferred tax assets    
Pension and postretirement benefits 126 307
Stock compensation 52 81
Foreign tax credit carryforwards 0 95
Foreign tax loss carryforwards 254 278
Capital loss carryforwards 64 57
State tax attributes 78 62
Deferred Tax Assets, Unrealized Currency Losses 103 58
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 17 0
Other 40 18
Gross deferred tax assets 734 956
Valuation allowances (264) (216)
Net deferred tax assets 470 740
Deferred Tax Liabilities, Net, Classification [Abstract]    
Noncurrent Liabilities (1,053) (1,669)
Net deferred tax liabilities (866) (1,511)
Domestic Tax Authority [Member]    
Deferred Tax Liabilities, Net, Classification [Abstract]    
Noncurrent Liabilities (934) (1,472)
Foreign [Member]    
Deferred Tax Liabilities, Net, Classification [Abstract]    
Noncurrent assets 187 158
Noncurrent Liabilities $ (119) $ (197)