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Total Invested Assets and Related Net Investment Income - Reconciliation of Assets and Liabilities Categorized in Level 3 (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | $ 152,785 |
Ending balance | 168,785 | $ 152,785
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 6,860 | 7,118
Fair value changes on investment properties | 19 | 305
Other invested assets |  |
Changes in fair value measurement, assets [abstract] |  |
Transfers (out) of Level 3 | (110) |
Investments for account of segregated fund holders |  |
Changes in fair value measurement, assets [abstract] |  |
Transfers (out) of Level 3 | (1,178) |
Recurring fair value measurement | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 10,821 | 11,648
Acquisitions |  | 13
Included in net income | (161) | 206
Included in OCI | 21 | 19
Purchases | 1,383 | 1,509
Sales / Payments | (688) | (940)
Settlements | (27) | (41)
Transfers into Level 3 | 6 | 15
Transfers (out) of Level 3 | (90) | (1,482)
Foreign currency translation | (34) | (126)
Ending balance | 11,231 | 10,821
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | (76) | 220
Acquisitions |  | 13
Recurring fair value measurement | Other invested assets | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 2,445 | 2,241
Acquisitions |  | 13
Included in net income | (87) | (80)
Included in OCI | 19 | 13
Purchases | 594 | 521
Sales / Payments | (304) | (122)
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers (out) of Level 3 | 0 | (110)
Foreign currency translation | (22) | (31)
Ending balance | 2,645 | 2,445
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | (68) | (78)
Acquisitions |  | 13
Recurring fair value measurement | Investment properties | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 7,306 | 7,157
Acquisitions |  | 0
Included in net income | (63) | 238
Included in OCI | 0 | 0
Purchases | 620 | 689
Sales / Payments | (325) | (701)
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers (out) of Level 3 | 0 | 0
Foreign currency translation | (22) | (77)
Ending balance | 7,516 | 7,306
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 13 | 272
Acquisitions |  | 0
Recurring fair value measurement | Total invested assets measured at fair value | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 10,272 | 10,052
Acquisitions |  | 13
Included in net income | (139) | 161
Included in OCI | 21 | 19
Purchases | 1,353 | 1,357
Sales / Payments | (674) | (881)
Settlements | (26) | (40)
Transfers into Level 3 | 5 | 15
Transfers (out) of Level 3 | (89) | (304)
Foreign currency translation | (42) | (120)
Ending balance | 10,681 | 10,272
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | (53) | 195
Acquisitions |  | 13
Recurring fair value measurement | Investments for account of segregated fund holders | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 549 | 1,596
Acquisitions |  | 0
Included in net income | (22) | 45
Included in OCI | 0 | 0
Purchases | 30 | 152
Sales / Payments | (14) | (59)
Settlements | (1) | (1)
Transfers into Level 3 | 1 | 0
Transfers (out) of Level 3 | (1) | (1,178)
Foreign currency translation | 8 | (6)
Ending balance | 550 | 549
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | (23) | 25
Acquisitions |  | 0
Fair value through profit or loss | Recurring fair value measurement | Debt securities | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 248 | 373
Acquisitions |  | 0
Included in net income | 11 | 28
Included in OCI | 0 | 0
Purchases | 67 | 85
Sales / Payments | (10) | (49)
Settlements | (9) | (40)
Transfers into Level 3 | 3 | 15
Transfers (out) of Level 3 | (88) | (159)
Foreign currency translation | 3 | (5)
Ending balance | 225 | 248
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 2 | 4
Acquisitions |  | 0
Fair value through profit or loss | Recurring fair value measurement | Equity securities | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 188 | 202
Acquisitions |  | 0
Included in net income | 0 | (2)
Included in OCI | 0 | 0
Purchases | 11 | 5
Sales / Payments | (2) | (9)
Settlements | (15) | 0
Transfers into Level 3 | 0 | 0
Transfers (out) of Level 3 | 0 | (4)
Foreign currency translation | (1) | (4)
Ending balance | 181 | 188
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 0 | (3)
Acquisitions |  | 0
Available-for-sale | Recurring fair value measurement | Debt securities | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 50 | 43
Acquisitions |  | 0
Included in net income | 0 | 0
Included in OCI | 2 | 4
Purchases | 15 | 35
Sales / Payments | 0 | 0
Settlements | (2) | 0
Transfers into Level 3 | 2 | 0
Transfers (out) of Level 3 | (1) | (31)
Foreign currency translation | 1 | (1)
Ending balance | 67 | 50
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 0 | 0
Acquisitions |  | 0
Available-for-sale | Recurring fair value measurement | Equity securities | Level 3 |  |
Changes in fair value measurement, assets [abstract] |  |
Beginning balance | 35 | 36
Acquisitions |  | 0
Included in net income | 0 | (23)
Included in OCI | 0 | 2
Purchases | 46 | 22
Sales / Payments | (33) | 0
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers (out) of Level 3 | 0 | 0
Foreign currency translation | (1) | (2)
Ending balance | 47 | 35
Changes in fair value measurement, liabilities [abstract] |  |
Fair value and foreign currency changes on assets and liabilities | 0 | 0
Acquisitions |  | 0
Leasing commissions and tenant inducements |  |
Changes in fair value measurement, liabilities [abstract] |  |
Fair value changes on investment properties | $ 82 | $ 67

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