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DEFERRED INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax on undistributed earnings $ 16  
Undistributed profits of foreign subsidiaries 16,112  
Deferred tax assets 98 $ 235
Deferred tax assets expected to be realized in more than one year 43  
Deferred tax liabilities 3,034 3,091
Unused tax losses, net 4,728  
Deductible temporary differences for which no deferred tax asset is recognised 3,053 3,161
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 1,127 1,097
2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 13  
2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 4  
2023    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 275  
2024    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 77  
2025+    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 2,830  
No expiry date    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses, net 1,529  
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 1,092 1,082
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 323 331
Alternative minimum tax (“AMT”) credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 13 28
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 3 11
Other | 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 $ 1,638 $ 1,748