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DEFERRED INCOME TAXES - Sources of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 259 $ 1,069
Deferred tax liabilities (1,236) (1,245)
Deferred tax liability (asset) 977 176
Before offset amount    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 938 1,902
Deferred tax liabilities (977) (176)
Tax loss carry forwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 537 926
Environmental rehabilitation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 292 594
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 175
Deferred tax liabilities (1,412) (1,571)
Post-retirement benefit obligations and other employee benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 27 49
Accrued interest payable    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1 40
Other working capital    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 32 23
Derivative instruments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 74
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 12 21
Inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities $ (503) $ (507)