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Income Taxes - Rate Reconciliations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]      
Earnings (loss) before income taxes $ 880 $ 353 $ (380)
Net earnings attributable to non-controlling interests not subject to tax (80) (94) (33)
Adjusted earnings (loss) before income taxes $ 800 $ 259 $ (413)
Statutory Canadian federal and provincial income tax rate (%) 23.40% 23.40% 23.60%
Expected income tax expense (recovery) $ 187 $ 61 $ (98)
Increase (decrease) in income taxes resulting from:      
Differences in effective foreign tax rates 9 (1) 4
Non-deductible expense 58 130 0
Taxable capital (gain) loss (2) 18 0
Deferred income tax recovery related to temporary difference on investment in subsidiaries (3) (2) 0
Write-down (reversal of write-down) of unrecognized deferred income tax assets (178) (24) 134
Statutory and other rate differences 1 (3) 4
Adjustments in respect of deferred income tax of previous years 1 6 (4)
Other 11 7 5
Income tax expense $ 84 $ 192 $ 45
Effective tax rate (%) 11.00% 74.00% (11.00%)