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INCOME TAXES - Deferred Income Tax Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets, gross $ 1,410 $ 761  
Deferred income tax liabilities, gross (5,898) (5,269)  
Deferred income tax assets 124 112  
Deferred income tax liabilities (4,612) (4,620)  
Net deferred income tax liabilities (4,488) (4,508) $ (3,346)
Tax losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets, gross 1,002 397  
Net deferred income tax liabilities 999 397 $ 394
Deferred tax assets recognized based on future projected profits 80 67  
Financial instruments and other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets, gross 408 364  
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities, gross (3,367) (2,541)  
Intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities, gross (2,458) (2,714)  
Investment in associates and investment properties      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities, gross $ (73) $ (14)