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INCOME TAXES - Deferred Tax Balances and Movement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities, beginning balance $ (1,424) $ (1,286)  
Net Income (102) (97)  
Other Comprehensive Income (68) (60) $ (36)
Other(1) 194 19  
Acquisitions (Dispositions) 0 0  
Net deferred income tax liabilities, ending balance (1,400) (1,424) (1,286)
Deferred tax assets related to non-capital losses and capital losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities, beginning balance 31 31  
Net Income 2 0  
Other Comprehensive Income 0 0  
Other(1) 1 0  
Acquisitions (Dispositions) 0 0  
Net deferred income tax liabilities, ending balance 34 31 31
Deferred tax liabilities related to differences in tax and book basis, net      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities, beginning balance (1,455) (1,317)  
Net Income (104) (97)  
Other Comprehensive Income (68) (60)  
Other(1) 193 19  
Acquisitions (Dispositions) 0 0  
Net deferred income tax liabilities, ending balance $ (1,434) $ (1,455) $ (1,317)