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INCOME TAXES - Deferred Tax Balances and Movement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Net deferred income tax liabilities $ (1,538) $ (1,303)  
Net Income (67) 18  
Other Comprehensive Income (200) (75) $ (141)
Other (48) 56  
Acquisitions (Dispositions) (930) (234)  
Net deferred income tax liabilities (2,783) (1,538) (1,303)
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 357 239  
Net Income (19) 17  
Other Comprehensive Income 0 0  
Other 23 4  
Acquisitions (Dispositions) 0 97  
Net deferred income tax liabilities 361 357 239
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 (1,895) (1,542)  
Net Income (48) 1  
Other Comprehensive Income (200) (75)  
Other (71) 52  
Acquisitions (Dispositions) (930) (331)  
Net deferred income tax liabilities $ (3,144) $ (1,895) $ (1,542)