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DEFERRED INCOME TAXES - Sources of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 235 $ 259
Deferred tax liabilities (3,091) (1,236)
Deferred tax liability (asset) 2,856 977
Before offset amount    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 978 938
Deferred tax liabilities (2,856) (977)
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (3,263) (1,412)
Environmental rehabilitation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 329 292
Tax loss carry forwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 511 537
Post-retirement benefit obligations and other employee benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 24 27
Accrued interest payable    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 1
Deferred tax liabilities (26) 0
Inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities (545) (503)
Other working capital    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 75 32
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 11 $ 12