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INCOME TAXES - Deferred Tax Balances and Movement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities $ (2,783) $ (1,538)  
Net Income (46) (67)  
Other Comprehensive Income (97) (200) $ (75)
Other 274 (48)  
Acquisitions (Dispositions) (694) (930)  
Net deferred income tax liabilities (3,346) (2,783) (1,538)
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 361 357  
Net Income (13) (19)  
Other Comprehensive Income 0 0  
Other 8 23  
Acquisitions (Dispositions) 38 0  
Net deferred income tax liabilities 394 361 357
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 (3,144) (1,895)  
Net Income (33) (48)  
Other Comprehensive Income (97) (200)  
Other 266 (71)  
Acquisitions (Dispositions) (732) (930)  
Net deferred income tax liabilities $ (3,740) $ (3,144) $ (1,895)