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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 $ 52 $ 46  
Deferred income tax liabilities (1,452) (1,470)  
Deferred tax assets 43 41  
Deferred tax liabilities (1,443) (1,465)  
Net deferred tax liabilities (1,400) (1,424) $ (1,286)
Financial instruments and other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 18 15  
Tax losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 34 31  
Net deferred tax liabilities 34 31 $ 31
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities (643) (505)  
Intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities $ (809) $ (965)