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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Abstract] |  |
Total net income (loss) | $ 4,370 | $ 2,792
Income tax expense (benefit) | 727 | 495
Total net income (loss) before income taxes | 5,097 | 3,287
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |
Taxes at the combined Canadian federal and provincial statutory income tax rate | 1,338 | 871
Higher (lower) effective rates on income subject to taxation in foreign jurisdictions | (231) | (218)
Tax-exempt investment (income) loss | (345) | (253)
Adjustments in respect of prior periods, including resolution of tax disputes | 49 | (55)
Tax (benefit) cost of unrecognized tax losses and tax credits | 6 | 15
Tax rate and other legislative changes | 10 | 1
Other | (2) | 24
Total income tax expense (benefit) | $ 727 | $ 495
Reconciliation of average effective tax rate and applicable tax rate [abstract] |  |
Taxes at the combined Canadian federal and provincial statutory income tax rate | 26.25% | 26.50%
Higher (lower) effective rates on income subject to taxation in foreign jurisdictions | (4.50%) | (6.60%)
Tax-exempt investment (income) loss | (6.80%) | (7.70%)
Adjustments in respect of prior periods, including resolution of tax disputes | (1.00%) | 1.70%
Tax (benefit) cost of unrecognized tax losses and tax credits | 0.10% | 0.50%
Tax rate and other legislative changes | 0.20% | 0.00%
Other | 0.00% | 0.70%
Effective income tax rate | 14.30% | 15.10%

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