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DEFERRED INCOME TAXES - Sources of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 1,069 $ 977
Deferred tax liabilities (1,245) (1,520)
Deferred tax liability (asset) 176 543
Before offset amount    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1,902 1,953
Deferred tax liabilities (176) (543)
Tax loss carry forwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 926 735
Environmental rehabilitation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 594 639
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 175 273
Deferred tax liabilities (1,571) (1,963)
Post-retirement benefit obligations and other employee benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 49 47
Accrued interest payable    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 40 75
Other working capital    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 23 54
Derivative instruments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 74 89
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 21 41
Inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities $ (507) $ (533)