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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, 2023 | Dec. 31, 2022
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | $ 833,689 |
Asset at end of period | 875,574 | $ 833,689
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 83,721 | 83,606
Net realized/unrealized gains (losses) included in net income | (964) | (3,798)
Net realized/unrealized gains (losses) included in net AOCI | 1,099 | (6,146)
Purchases | 9,626 | 10,821
Sales | (3,472) | (4,624)
Settlements | (2,315) | (1,779)
Transfer into Level | 2,605 | 3,237
Transfer out of Level | (2,939) | (761)
Currency Movement | (1,970) | 3,165
Asset at end of period | 85,391 | 83,721
Change in unrealized gains (losses) on assets still held | (549) | (1,976)
Level 3 [Member] | Derivatives [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Derivatives Beginning of period | (3,188) | 2,101
Net realized/unrealized gains (losses) included in net income | (144) | (5,429)
Net realized/unrealized gains (losses) included in net AOCI |  | (7)
Purchases |  | (109)
Sales |  | 0
Settlements | 960 | 775
Transfer out of Level | 165 | (356)
Currency Movement | 41 | (163)
Derivatives at end of period | (2,166) | (3,188)
Change in unrealized gains (losses) on assets still held | 17 | (3,527)
Level 3 [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Transfer out of Level | (68) |
Level 3 [Member] | Own use property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 2,682 |
Net realized/unrealized gains (losses) included in net income | (234) |
Purchases | 20 |
Currency Movement | (38) |
Asset at end of period | 2,430 | 2,682
Change in unrealized gains (losses) on assets still held | (234) |
Level 3 [Member] | Segregated funds net assets [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 3,985 | 4,281
Net realized/unrealized gains (losses) included in net income | (97) | 475
Purchases | 110 | 246
Sales | (466) | (1,113)
Settlements | 24 | (46)
Transfer out of Level | (15) | (1)
Currency Movement | (49) | 143
Asset at end of period | 3,492 | 3,985
Change in unrealized gains (losses) on assets still held | 32 | 79
Level 3 [Member] | FVOCI [Member] | Private placements [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 7,828 | 5,136
Net realized/unrealized gains (losses) included in net income | (4) | (9)
Net realized/unrealized gains (losses) included in net AOCI | 258 | (1,453)
Purchases | 1,942 | 1,697
Sales | (497) | (89)
Settlements | (1,172) | (188)
Transfer into Level | 2,546 | 2,876
Transfer out of Level | (2,907) | (362)
Currency Movement | (312) | 220
Asset at end of period | 7,682 | 7,828
Level 3 [Member] | FVOCI [Member] | Mortgages [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 28,621 | 31,798
Net realized/unrealized gains (losses) included in net income | 65 | (76)
Net realized/unrealized gains (losses) included in net AOCI | 830 | (4,692)
Purchases | 1,984 | 3,511
Sales | (1,626) | (2,411)
Settlements | (856) | (757)
Currency Movement | (545) | 1,248
Asset at end of period | 28,473 | 28,621
Level 3 [Member] | FVOCI [Member] | Other government and agency [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 9 |
Purchases | 2 |
Transfer into Level |  | 9
Currency Movement | (1) |
Asset at end of period | 10 | 9
Level 3 [Member] | FVOCI [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 32 | 41
Net realized/unrealized gains (losses) included in net AOCI | 3 | (1)
Purchases | 178 | 27
Settlements | (7) | (1)
Transfer into Level | 25 | 6
Transfer out of Level |  | (42)
Currency Movement |  | 2
Asset at end of period | 231 | 32
Level 3 [Member] | FVOCI [Member] | Other securitized assets [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 26 | 28
Net realized/unrealized gains (losses) included in net AOCI | 1 | 2
Settlements | (5) | (4)
Currency Movement | (1) |
Asset at end of period | 21 | 26
Level 3 [Member] | FVTPL [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 71 |
Net realized/unrealized gains (losses) included in net income |  | (6)
Purchases | 37 | 69
Sales |  | (84)
Transfer into Level |  | 87
Transfer out of Level | (67) |
Currency Movement |  | 5
Asset at end of period | 41 | 71
Change in unrealized gains (losses) on assets still held |  | (13)
Level 3 [Member] | FVTPL [Member] | Private placements [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 31 | 30
Net realized/unrealized gains (losses) included in net income | 44 | (7)
Purchases | 17 |
Settlements | (1) | (1)
Transfer into Level | 34 | 9
Transfer out of Level | (47) |
Currency Movement | 1 |
Asset at end of period | 79 | 31
Change in unrealized gains (losses) on assets still held | 44 | (7)
Level 3 [Member] | FVTPL [Member] | Mortgages [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 1,138 | 1,203
Net realized/unrealized gains (losses) included in net income | 37 | (117)
Purchases | 160 | 110
Sales | (239) | (22)
Settlements | (39) | (38)
Currency Movement | (2) | 2
Asset at end of period | 1,055 | 1,138
Level 3 [Member] | Real estate [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 82,924 | 77,224
Net realized/unrealized gains (losses) included in net income | (723) | 1,156
Net realized/unrealized gains (losses) included in net AOCI | 1,099 | (6,139)
Purchases | 9,516 | 10,684
Sales | (3,006) | (3,511)
Settlements | (3,299) | (2,508)
Transfer into Level | 2,605 | 3,237
Transfer out of Level | (3,089) | (404)
Currency Movement | (1,962) | 3,185
Asset at end of period | 84,065 | 82,924
Change in unrealized gains (losses) on assets still held | (598) | 1,472
Level 3 [Member] | Real estate [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 31,069 | 24,884
Net realized/unrealized gains (losses) included in net income | 423 | 1,934
Net realized/unrealized gains (losses) included in net AOCI | 7 | 5
Purchases | 4,760 | 4,938
Sales | (522) | (668)
Settlements | (1,219) | (1,519)
Transfer into Level |  | 248
Currency Movement | (865) | 1,247
Asset at end of period | 33,585 | 31,069
Change in unrealized gains (losses) on assets still held | 647 | 2,057
Level 3 [Member] | Real estate [Member] | Investment property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 11,417 | 11,443
Net realized/unrealized gains (losses) included in net income | (1,054) | (443)
Purchases | 416 | 312
Sales | (122) | (237)
Transfer into Level |  | 17
Currency Movement | (199) | 325
Asset at end of period | 10,458 | 11,417
Change in unrealized gains (losses) on assets still held | (1,055) | (445)
Level 3 [Member] | Real estate [Member] | Own use property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | $ 2,682 | 2,661
Net realized/unrealized gains (losses) included in net income |  | (120)
Purchases |  | 20
Transfer into Level |  | (15)
Currency Movement |  | 136
Asset at end of period |  | 2,682
Change in unrealized gains (losses) on assets still held |  | $ (120)

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