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INCOME TAXES - Deferred Tax Balances and Movement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities $ (3,346) $ (2,783)  
Net Income (28) (46)  
Other Comprehensive Income (142) (97) $ (200)
Other 32 274  
Acquisitions/ Dispositions (1,024) (694)  
Net deferred income tax liabilities (4,508) (3,346) (2,783)
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 394 361  
Net Income 40 (13)  
Other Comprehensive Income 0 0  
Other (22) 8  
Acquisitions/ Dispositions (15) 38  
Net deferred income tax liabilities 397 394 361
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 (3,740) (3,144)  
Net Income (68) (33)  
Other Comprehensive Income (142) (97)  
Other 54 266  
Acquisitions/ Dispositions (1,009) (732)  
Net deferred income tax liabilities $ (4,905) $ (3,740) $ (3,144)