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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, 2018 | Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | $ 729,533 |
Asset at end of period | 750,271 | $ 729,533
Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 174,000 |
Asset at end of period | 185,594 | 174,000
Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 21,545 |
Asset at end of period | 19,179 | 21,545
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 34,101 | 33,282
Net realized/unrealized gains (losses) included in net income | (644) | 770
Net realized/unrealized gains (losses) included in net AOCI | 2 | 1
Purchases | 4,999 | 4,707
Sales | (4,754) | (2,077)
Settlements | (880) | (942)
Transfer into Level 3 | 3 | 25
Transfer out of Level 3 | (915) | (205)
Currency Movement | 1,991 | (1,460)
Asset at end of period | 33,903 | 34,101
Change in unrealized gains (losses) on assets still held | (36) | 558
Level 3 [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 16,203 | 14,849
Net realized/unrealized gains (losses) included in net income | (1,168) | 395
Net realized/unrealized gains (losses) included in net AOCI | 1 |
Purchases | 3,926 | 3,022
Sales | (1,636) | (435)
Settlements | (841) | (837)
Transfer out of Level 3 | (35) |
Currency Movement | 1,112 | (791)
Asset at end of period | 17,562 | 16,203
Change in unrealized gains (losses) on assets still held | (434) | 244
Level 3 [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 3 | 7
Sales |  | (4)
Asset at end of period | 3 | 3
Level 3 [Member] | Real estate and other [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 28,732 | 27,605
Net realized/unrealized gains (losses) included in net income | (877) | 696
Net realized/unrealized gains (losses) included in net AOCI | 1 |
Purchases | 4,541 | 4,279
Sales | (4,214) | (1,702)
Settlements | (841) | (837)
Transfer out of Level 3 | (741) |
Currency Movement | 1,722 | (1,309)
Asset at end of period | 28,323 | 28,732
Change in unrealized gains (losses) on assets still held | (190) | 508
Level 3 [Member] | Segregated funds net assets [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 4,255 | 4,574
Net realized/unrealized gains (losses) included in net income | 226 | 60
Purchases | 155 | 261
Sales | (367) | (248)
Settlements | 1 | (54)
Transfer into Level 3 | 3 |
Transfer out of Level 3 | (17) | (184)
Currency Movement | 191 | (154)
Asset at end of period | 4,447 | 4,255
Change in unrealized gains (losses) on assets still held | 161 | 45
Level 3 [Member] | FVTPL [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 975 | 966
Net realized/unrealized gains (losses) included in net income | 7 | 15
Purchases | 248 | 131
Sales | (146) | (97)
Settlements | (32) | (43)
Transfer into Level 3 |  | 24
Transfer out of Level 3 | (149) | (21)
Currency Movement | 68 |
Asset at end of period | 971 | 975
Change in unrealized gains (losses) on assets still held | (7) | 5
Level 3 [Member] | FVTPL [Member] | Public equities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 3 | 7
Sales |  | (4)
Asset at end of period | 3 | 3
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 | 239 | 272
Net realized/unrealized gains (losses) included in net income | (2) | (3)
Purchases | 27 | 26
Sales | (85) | (58)
Settlements | (14) | (6)
Currency Movement | 15 | 8
Asset at end of period | 180 | 239
Change in unrealized gains (losses) on assets still held | (3) | (3)
Level 3 [Member] | FVTPL [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 710 | 651
Net realized/unrealized gains (losses) included in net income | 3 | 19
Purchases | 190 | 105
Sales | (61) | (34)
Settlements | (18) | (29)
Transfer into Level 3 |  | 24
Transfer out of Level 3 | (93) | (21)
Currency Movement | 53 | (5)
Asset at end of period | 784 | 710
Change in unrealized gains (losses) on assets still held | (10) | 10
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 | 1 | 2
Net realized/unrealized gains (losses) included in net income | 6 |
Currency Movement |  | (1)
Asset at end of period | 7 | 1
Change in unrealized gains (losses) on assets still held | 6 | (1)
Level 3 [Member] | FVTPL [Member] | Commercial mortgage asset-backed securities [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 6
Sales |  | (5)
Settlements |  | (1)
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 | 25 | 35
Net realized/unrealized gains (losses) included in net income |  | (1)
Purchases | 31 |
Settlements |  | (7)
Transfer out of Level 3 | (56) |
Currency Movement |  | (2)
Asset at end of period |  | 25
Change in unrealized gains (losses) on assets still held |  | (1)
Level 3 [Member] | AFS [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 136 | 130
Net realized/unrealized gains (losses) included in net income |  | (1)
Net realized/unrealized gains (losses) included in net AOCI | 1 | 1
Purchases | 55 | 36
Sales | (27) | (26)
Settlements | (8) | (8)
Transfer into Level 3 |  | 1
Transfer out of Level 3 | (8) |
Currency Movement | 10 | 3
Asset at end of period | 159 | 136
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 | 47 | 51
Net realized/unrealized gains (losses) included in net income |  | (1)
Net realized/unrealized gains (losses) included in net AOCI |  | (2)
Purchases | 6 | 14
Sales | (15) | (15)
Settlements | (4) | (2)
Transfer into Level 3 |  | 1
Currency Movement | 3 | 1
Asset at end of period | 37 | 47
Level 3 [Member] | AFS [Member] | Corporate [member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 88 | 74
Net realized/unrealized gains (losses) included in net AOCI |  | 4
Purchases | 49 | 22
Sales | (12) | (10)
Settlements | (4) | (4)
Transfer out of Level 3 | (7) |
Currency Movement | 6 | 2
Asset at end of period | 120 | 88
Level 3 [Member] | AFS [Member] | Residential mortgage asset-backed securities [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 1
Net realized/unrealized gains (losses) included in net AOCI | 1 | (1)
Currency Movement | 1 |
Asset at end of period | 2 |
Level 3 [Member] | AFS [Member] | Commercial mortgage asset-backed securities [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period |  | 2
Sales |  | (1)
Settlements |  | (1)
Level 3 [Member] | AFS [Member] | Other securitized assets [Member] | Debt securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 1 | 2
Settlements |  | (1)
Transfer out of Level 3 | (1) |
Asset at end of period |  | 1
Level 3 [Member] | Real estate [Member] | Investment property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Asset Beginning of period | 12,529 | 12,756
Net realized/unrealized gains (losses) included in net income | 291 | 301
Purchases | 615 | 1,257
Sales | (2,578) | (1,267)
Transfer out of Level 3 | (706) |
Currency Movement | 610 | (518)
Asset at end of period | 10,761 | 12,529
Change in unrealized gains (losses) on assets still held | $ 244 | $ 264

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