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DEFERRED INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Undistributed profits of foreign subsidiaries $ 3,916  
Deferred tax assets 1,069 $ 977
Deferred tax assets expected to be realized in more than one year 1,064  
Deferred tax liabilities 1,245 1,520
Deferred tax liabilities expected to be realized in more than one year 1,228  
Unused tax losses, net 9,153  
Deductible temporary differences for which no deferred tax asset is recognised 2,449 2,613
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 661 569
Deductible temporary differences for which no deferred tax asset is recognised 388 377
2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 4,843  
2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 922  
2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 217  
2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 296  
After 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,009  
No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,866  
Subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax on undistributed earnings 239  
Deferred tax liability on undistributed earnings 155  
Subsidiaries | Foreign countries [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 98 126
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 690 638
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 452 440
Alternative minimum tax (“AMT”) credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 0 113
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 21 41
Deductible temporary differences for which no deferred tax asset is recognised $ 1,307 $ 0