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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, 2020 | Dec. 31, 2019
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | $ 809,130 |
Asset at end of period | 880,349 | $ 809,130
Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 198,122 |
Asset at end of period | 218,725 | 198,122
Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 22,851 |
Asset at end of period | 23,722 | 22,851
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 35,721 | 34,009
Net realized/unrealized gains (losses) included in net income | 2,281 | 3,287
Net realized/unrealized gains (losses) included in net AOCI | (65) | 46
Purchases | 3,716 | 4,190
Sales | (1,815) | (2,560)
Settlements | (1,831) | (1,768)
Transfer into Level | 352 | 666
Transfer out of Level | 273 | (984)
Currency Movement | (398) | (1,165)
Asset at end of period | 38,234 | 35,721
Change in unrealized gains (losses) on assets still held | 981 | 2,636
Level 3 [Member] | Derivatives [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 1,456 | 106
Net realized/unrealized gains (losses) included in net income | 2,953 | 1,884
Net realized/unrealized gains (losses) included in net AOCI | (18) | 44
Purchases | 12 | 42
Settlements | (1,165) | (685)
Transfer into Level |  | 135
Transfer out of Level | 342 | (34)
Currency Movement | (137) | (36)
Asset at end of period | 3,443 | 1,456
Change in unrealized gains (losses) on assets still held | 2,033 | 1,423
Level 3 [Member] | Segregated funds net assets [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 4,512 | 4,447
Net realized/unrealized gains (losses) included in net income | (6) | 148
Purchases | (84) | 193
Sales | (149) | (140)
Settlements | (26) | (30)
Transfer into Level | 2 |
Transfer out of Level | (3) |
Currency Movement | (44) | (106)
Asset at end of period | 4,202 | 4,512
Change in unrealized gains (losses) on assets still held | 45 | 111
Level 3 [Member] | FVTPL [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 3
Net realized/unrealized gains (losses) included in net income |  | 1,739
Sales |  | (1,679)
Currency Movement |  | (63)
Change in unrealized gains (losses) on assets still held |  | 1,510
Level 3 [Member] | FVTPL [Member] | Other government and agency [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 0 | 180
Net realized/unrealized gains (losses) included in net income |  | 1
Purchases |  | 16
Sales |  | (18)
Transfer out of Level |  | (178)
Currency Movement |  | (1)
Asset at end of period |  | 0
Level 3 [Member] | FVTPL [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 633 | 784
Net realized/unrealized gains (losses) included in net income | 4 | 35
Purchases | 54 | 43
Sales | (272) | (88)
Settlements | (1) | (18)
Transfer into Level | 151 | 514
Transfer out of Level | (50) | (604)
Currency Movement | (9) | (33)
Asset at end of period | 510 | 633
Change in unrealized gains (losses) on assets still held | 105 | 47
Level 3 [Member] | FVTPL [Member] | Residential mortgage asset-backed securities [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 7
Sales |  | (1)
Transfer out of Level |  | (6)
Level 3 [Member] | FVTPL [Member] | Other securitized assets [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Net realized/unrealized gains (losses) included in net income | (8) |
Settlements | (1) |
Transfer into Level | 55 |
Currency Movement | (1) |
Asset at end of period | 45 |
Level 3 [Member] | AFS [Member] | Other government and agency [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 37
Net realized/unrealized gains (losses) included in net income |  | 1
Purchases |  | 5
Sales |  | (12)
Transfer out of Level |  | (31)
Level 3 [Member] | AFS [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 15 | 122
Net realized/unrealized gains (losses) included in net income | (6) | 1
Net realized/unrealized gains (losses) included in net AOCI | 2 |
Purchases |  | 13
Sales |  | (21)
Settlements |  | (4)
Transfer into Level | 5 |
Transfer out of Level | (13) | (94)
Currency Movement |  | (2)
Asset at end of period | 3 | 15
Level 3 [Member] | AFS [Member] | Commercial mortgage asset-backed securities [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Purchases |  | 37
Transfer out of Level |  | (37)
Level 3 [Member] | Real estate [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 29,753 | 29,456
Net realized/unrealized gains (losses) included in net income | (666) | 1,255
Net realized/unrealized gains (losses) included in net AOCI | (47) | 2
Purchases | 3,788 | 3,955
Sales | (1,666) | (2,420)
Settlements | (640) | (1,053)
Transfer into Level | 350 | 531
Transfer out of Level | (66) | (950)
Currency Movement | (217) | (1,023)
Asset at end of period | 30,589 | 29,753
Change in unrealized gains (losses) on assets still held | (1,097) | 1,102
Level 3 [Member] | Real estate [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 18,103 | 17,562
Net realized/unrealized gains (losses) included in net income | (401) | (1,028)
Net realized/unrealized gains (losses) included in net AOCI | (49) | 2
Purchases | 3,162 | 3,401
Sales | (1,076) | (144)
Settlements | (638) | (1,031)
Transfer into Level | 92 | 2
Transfer out of Level | (3) |
Currency Movement | (141) | (661)
Asset at end of period | 19,049 | 18,103
Change in unrealized gains (losses) on assets still held | (902) | (923)
Level 3 [Member] | Real estate [Member] | Investment property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 11,002 | 10,761
Net realized/unrealized gains (losses) included in net income | (255) | 506
Purchases | 572 | 440
Sales | (318) | (457)
Transfer into Level | 47 | 15
Currency Movement | (66) | (263)
Asset at end of period | 10,982 | 11,002
Change in unrealized gains (losses) on assets still held | $ (300) | $ 468

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