XML 115 R69.htm IDEA: XBRL DOCUMENT v3.21.1
SEGMENTED INFORMATION - Schedule of components of income tax expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [abstract]    
Current income tax expense $ (756) $ (970)
Deferred income tax (expense) recovery (81) 475
Income tax (expense) recovery $ (837) $ (495)