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DEFERRED INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Undistributed profits of foreign subsidiaries $ 5,861  
Deferred tax assets 259 $ 1,069
Deferred tax assets expected to be realized in more than one year 242  
Deferred tax liabilities 1,236 1,245
Deferred tax liabilities expected to be realized in more than one year 1,211  
Unused tax losses, net 8,327  
Deductible temporary differences for which no deferred tax asset is recognised 3,043 2,449
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 1,087 388
2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,843  
2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 435  
2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 107  
2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 590  
After 2023    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 3,483  
No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,869  
Subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax on undistributed earnings 211  
Deferred tax liability on undistributed earnings 47  
Subsidiaries | Foreign countries [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 83 98
Non-capital tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 1,134 690
Capital tax losses | No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 447 452
Alternative minimum tax (“AMT”) credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 37 0
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 12 21
Deductible temporary differences for which no deferred tax asset is recognised $ 1,462 $ 0