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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Type of Hedge (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of detailed information about financial instruments [line items] |  |
Fair value | $ 160,982 | $ 177,789
Derivative investments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total notional amount | 68,417 | 64,761
Fair value | 2,077 | 1,536
Liabilities | (2,330) | (1,390)
Fair value hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total notional amount | 59 | 414
Fair value | 0 | 1
Liabilities | (1) | (2)
Cash flow hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total notional amount | 1,292 | 791
Fair value | 18 | 46
Liabilities | (20) | 0
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total notional amount | 69,768 | 65,966
Fair value | 2,095 | 1,583
Liabilities | $ (2,351) | $ (1,392)

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