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Total Invested Assets and Related Net Investment Income - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 CAD ($) $ / square_foot | Dec. 31, 2019 CAD ($)
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Derivative liabilities | $ 1,744,000,000 | $ 2,040,000,000
Net ineffectiveness on fair value hedges | (1,000,000) | (1,000,000)
Financial assets | $ 168,785,000,000 | $ 152,785,000,000
Repurchase agreement interest rate | 0.37% | 1.81%
Financial assets, at fair value | $ 175,070,000,000 | $ 156,591,000,000
Carrying value of securities lent | 2,208,000,000 | 1,850,000,000
Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial liabilities, at fair value | 1,233,000,000 | 972,000,000
Mortgages and loans |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 49,946,000,000 | 48,222,000,000
Financial assets, at fair value | 56,231,000,000 | 52,028,000,000
Asset-backed securities |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | $ 8,805,000,000 | 8,402,000,000
Mortgages: | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Risk-adjusted spreads | 20 years |
Asset-Backed Securities In Principal Reinvestment Account |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | $ 145,000,000 | 124,000,000
Financial assets | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 12,327,000,000 | 10,170,000,000
Securitized mortgages |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 1,781,000,000 | 1,587,000,000
Financial assets, at fair value | 1,873,000,000 | 1,592,000,000
Cash And Cash Equivalents In Principal Reinvestment Account |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 0 | 0
Transferred Assets |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets, at fair value | 2,208,000,000 | 1,850,000,000
Securities lending |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Carrying value of securities lent | 1,974,000,000 | 2,006,000,000
Collateral associated with securities lending |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Carrying value of securities lent | $ 2,063,000,000 | 2,128,000,000
Loans | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Risk-adjusted spreads | 10 years |
Bottom of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Repurchase agreement maturity period | 7 days |
Top of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Repurchase agreement maturity period | 365 days |
Weighted average |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Repurchase agreement maturity period | 86 days |
Securitized mortgages |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial liabilities | $ 1,912,000,000 | 1,715,000,000
Financial liabilities, at fair value | 2,032,000,000 | 1,734,000,000
Fair value through profit or loss | Asset-backed securities |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 6,742,000,000 | 5,568,000,000
Fair value through profit or loss | Financial assets | Level 2 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 43,904,000,000 | 41,858,000,000
Measured at fair value |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Derivative liabilities | $ 1,744,000,000 | $ 2,040,000,000
Discounted cash flow | Bottom of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Rental growth rate (per annum) | 0.00% |
Long-term vacancy rate | 2.00% |
Discount rate | 4.00% |
Terminal capitalization rate | 4.25% |
Discounted cash flow | Top of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Rental growth rate (per annum) | 3.00% |
Long-term vacancy rate | 10.00% |
Discount rate | 10.25% |
Terminal capitalization rate | 8.75% |
Discounted cash flow | Retail and office properties | Bottom of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Estimated rental value (per square foot, per annum) | $ / square_foot | 12.00 |
Discounted cash flow | Retail and office properties | Top of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Estimated rental value (per square foot, per annum) | $ / square_foot | 76.00 |
Discounted cash flow | Industrial properties | Bottom of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Estimated rental value (per square foot, per annum) | $ / square_foot | 3.00 |
Discounted cash flow | Industrial properties | Top of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Estimated rental value (per square foot, per annum) | $ / square_foot | 21.50 |
Discounted cash flow | Investment property |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Expected return period | 10 years |
Scenario, Forecast |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Reclassification adjustments on cash flow hedges, before tax | $ 6,000,000 |

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