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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 $ (4,508) $ (3,346)  
Net Income (54) (28)  
Other Comprehensive Income (125) (142) $ (97)
Other 20 32  
Acquisitions/ Dispositions 179 (1,024)  
Net deferred income tax liabilities (4,488) (4,508) (3,346)
Deferred income tax assets related to non-capital losses and capital losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities 397 394  
Net Income 506 40  
Other Comprehensive Income 0 0  
Other 146 (22)  
Acquisitions/ Dispositions (50) (15)  
Net deferred income tax liabilities 999 397 394
Deferred income 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 (4,905) (3,740)  
Net Income (560) (68)  
Other Comprehensive Income (125) (142)  
Other (126) 54  
Acquisitions/ Dispositions 229 (1,009)  
Net deferred income tax liabilities $ (5,487) $ (4,905) $ (3,740)