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Total Invested Assets and Related Net Investment Income - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | $ 173,735,000,000 | $ 168,785,000,000
Other financial liabilities | 1,810,000,000 | 1,136,000,000
Derivative financial liabilities | 1,392,000,000 | 1,744,000,000
Obligations for securities borrowing | 51,000,000 | 0
Collateralized loan obligation | 1,726,000,000 | 0
Assets supporting CLOs | 1,865,000,000 | 0
Maximum contractual exposure to credit risk of loans or receivables | 104,000,000 | 0
Net ineffectiveness on fair value hedges | 2,000,000 | 1,000,000
Financial assets, at fair value | $ 177,789,000,000 | $ 175,070,000,000
Repurchase agreement interest rate | 0.35% | 0.37%
Carrying value of securities lent | $ 2,324,000,000 | $ 2,208,000,000
Cash collateral on securities lent |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Gross financial liabilities presented in the Consolidated Statements of Financial Position | 51,000,000 | 306,000,000
Securitized mortgages |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial liabilities, at fair value | 2,043,000,000 | 2,032,000,000
Financial liabilities | 2,007,000,000 | 1,912,000,000
Scenario, Forecast |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Reclassification expectation from AOCI to net income | $ 7,000,000 | 6,000,000
Bottom of range |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Repurchase agreement maturity period | 5 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 | 105 days |
Discounted cash flow | Investment property |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Expected return period | 10 years |
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 | 4.75% |
Terminal capitalization rate | 4.00% |
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 | 9.50% |
Terminal capitalization rate | 7.75% |
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) | 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) | 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) | 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) | 21.50 |
Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Derivative financial liabilities | $ 1,392,000,000 | 1,744,000,000
Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial liabilities, at fair value | 1,865,000,000 | 1,233,000,000
Financial assets | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | $ 12,268,000,000 | 12,327,000,000
Mortgages | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Risk-adjusted spreads | 20 years |
Loans | Level 3 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Risk-adjusted spreads | 10 years |
Securitized mortgages |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | $ 1,856,000,000 | 1,781,000,000
Financial assets, at fair value | 1,882,000,000 | 1,873,000,000
Asset-Backed Securities In Principal Reinvestment Account |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 164,000,000 | 145,000,000
Cash And Cash Equivalents In Principal Reinvestment Account |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 4,000,000 | 0
Transferred Assets |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets, at fair value | 2,324,000,000 | 2,208,000,000
Collateral associated with securities lending |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Carrying value of securities lent | 2,372,000,000 | 2,063,000,000
Securities lending |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Carrying value of securities lent | 2,257,000,000 | 1,974,000,000
Fair value through profit or loss | Financial assets | Level 2 |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Financial assets | 43,488,000,000 | $ 43,904,000,000
Cash and Accounts Receivable |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Assets supporting CLOs | 319,000,000 |
Loans |  |
Disclosure Of Fair Value Measurement of Assets and Liabilities [Line Items] |  |
Assets supporting CLOs | $ 1,546,000,000 |

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