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DEFERRED INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Undistributed profits of foreign subsidiaries $ 16,470  
Deferred tax assets 235 $ 259
Deferred tax assets expected to be realized in more than one year 218  
Deferred tax liabilities 3,091 1,236
Unused tax losses, net 6,037  
Deductible temporary differences for which no deferred tax asset is recognised 2,875 3,043
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 1,097 1,087
2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 128  
2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 440  
After 2023    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 3,623  
No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,846  
Subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax on undistributed earnings 33  
Subsidiaries | Foreign countries [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 53 83
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 1,058 1,134
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 331 447
Alternative minimum tax (“AMT”) credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 28 37
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 11 12
Deductible temporary differences for which no deferred tax asset is recognised $ 1,486 $ 1,462