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Income Taxes - Rate Reconciliations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]      
Earnings (loss) before income taxes $ (380) $ (303) $ 193
Net earnings (loss) attributable to non-controlling interests not subject to tax (33) 2 (26)
Adjusted earnings (loss) before income taxes $ (413) $ (301) $ 167
Statutory Canadian federal and provincial income tax rate 23.60% 24.50% 26.50%
Expected income tax expense (recovery) $ (98) $ (74) $ 44
Increase (decrease) in income taxes resulting from:      
Differences in effective foreign tax rates 4 3 5
Deferred income tax expense related to temporary difference on investment in subsidiaries 0 9 0
Write-down (reversal of write-down) of unrecognized deferred income tax assets 134 8 (9)
Statutory and other rate differences 4 (7) (31)
Other 1 11 8
Income tax expense (recovery) $ 45 $ (50) $ 17
Effective tax rate (11.00%) 17.00% 10.00%