XML 227 R146.htm IDEA: XBRL DOCUMENT v3.20.4
DEFERRED INCOME TAXES - Deferred Tax Assets Not Recognized (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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
No expiry date | 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 323 331
No expiry date | Other    
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