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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | $ 917,643 |
Asset at end of period | 848,941 | $ 917,643
Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 224,139 |
Asset at end of period | 203,904 | 224,139
Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 28,067 |
Asset at end of period | 23,519 | 28,067
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 41,915 | 38,234
Net realized/unrealized gains (losses) included in net income | (3,465) | 2,901
Net realized/unrealized gains (losses) included in net AOCI | 1 | 2
Purchases | 5,479 | 5,399
Sales | (2,100) | (1,977)
Settlements | (750) | (1,702)
Transfer into Level | 366 | 44
Transfer out of Level | (398) | (718)
Currency Movement | 1,527 | (268)
Asset at end of period | 42,575 | 41,915
Change in unrealized gains (losses) on assets still held | (1,846) | 2,752
Level 3 [Member] | Derivatives [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 2,101 | 3,443
Net realized/unrealized gains (losses) included in net income | (5,413) | (897)
Net realized/unrealized gains (losses) included in net AOCI | (7) |
Purchases | (109) | 14
Settlements | 775 | (182)
Transfer out of Level | (356) | (309)
Currency Movement | (163) | 32
Asset at end of period | (3,172) | 2,101
Change in unrealized gains (losses) on assets still held | (3,511) | (547)
Level 3 [Member] | Segregated funds net assets [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 4,281 | 4,202
Net realized/unrealized gains (losses) included in net income | 475 | 350
Purchases | 246 | 68
Sales | (1,113) | (303)
Settlements | (46) | (28)
Transfer out of Level | (1) |
Currency Movement | 143 | (8)
Asset at end of period | 3,985 | 4,281
Change in unrealized gains (losses) on assets still held | 79 | 116
Level 3 [Member] | FVTPL [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Net realized/unrealized gains (losses) included in net income | (6) |
Purchases | 69 | 62
Sales | (84) | (62)
Transfer into Level | 87 |
Currency Movement | 5 |
Asset at end of period | 71 |
Change in unrealized gains (losses) on assets still held | (15) |
Level 3 [Member] | FVTPL [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 40 | 510
Net realized/unrealized gains (losses) included in net income | (1) | 11
Purchases | 27 | 11
Sales |  | (93)
Settlements | (1) |
Transfer into Level | 6 | 11
Transfer out of Level | (40) | (409)
Currency Movement | 1 | (1)
Asset at end of period | 32 | 40
Change in unrealized gains (losses) on assets still held | (1) | (8)
Level 3 [Member] | FVTPL [Member] | Other securitized assets [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 28 | 45
Net realized/unrealized gains (losses) included in net income | 2 | 3
Sales |  | (9)
Settlements | (4) | (39)
Transfer into Level |  | 28
Asset at end of period | 26 | 28
Change in unrealized gains (losses) on assets still held | 2 | (4)
Level 3 [Member] | AFS [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Net realized/unrealized gains (losses) included in net income | (1) |
Net realized/unrealized gains (losses) included in net AOCI | 1 |
Level 3 [Member] | AFS [Member] | Other government and agency [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Transfer into Level | 10 |
Currency Movement | (1) |
Asset at end of period | 9 |
Level 3 [Member] | AFS [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 1 | 3
Net realized/unrealized gains (losses) included in net income |  | 1
Sales |  | (3)
Transfer out of Level | (1) |
Asset at end of period |  | 1
Level 3 [Member] | Real estate [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 35,533 | 30,589
Net realized/unrealized gains (losses) included in net income | 1,473 | 3,448
Net realized/unrealized gains (losses) included in net AOCI | 8 | 2
Purchases | 5,342 | 5,317
Sales | (987) | (1,674)
Settlements | (1,479) | (1,492)
Transfer into Level | 366 | 44
Transfer out of Level | (41) | (409)
Currency Movement | 1,547 | (292)
Asset at end of period | 41,762 | 35,533
Change in unrealized gains (losses) on assets still held | 1,586 | 3,183
Level 3 [Member] | Real estate [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 24,043 | 19,049
Net realized/unrealized gains (losses) included in net income | 1,922 | 2,731
Net realized/unrealized gains (losses) included in net AOCI | 7 | 2
Purchases | 4,934 | 5,058
Sales | (666) | (1,131)
Settlements | (1,474) | (1,453)
Transfer into Level | 248 | 5
Currency Movement | 1,216 | (218)
Asset at end of period | 30,230 | 24,043
Change in unrealized gains (losses) on assets still held | 2,046 | 2,569
Level 3 [Member] | Real estate [Member] | Investment property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 11,421 | 10,982
Net realized/unrealized gains (losses) included in net income | (443) | 702
Purchases | 312 | 186
Sales | (237) | (376)
Transfer into Level | 15 |
Currency Movement | 326 | (73)
Asset at end of period | 11,394 | 11,421
Change in unrealized gains (losses) on assets still held | $ (446) | $ 626

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