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Invested Assets and Investment Income - Schedule of Investment Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | $ 1,013 | $ 1,120
Net Investment income | 4,532 | 19,367
Investment income | 13,560 | 13,649
Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 6,078 | 5,679
Gains (losses) | (6,303) | 3,485
Impairment loss | (18) | 15
Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 268 | 160
Gains (losses) | (12) | (25)
Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 556 | 603
Gains (losses) | (1,266) | 2,598
Impairment loss | 43 | (14)
Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,824 | 1,685
Gains (losses) | 56 | 69
Provision, net | 8 | (32)
Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,729 | 1,553
Gains (losses) | (83) | 43
Impairment loss | 10 | 10
Policy loans [member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 371 | 365
Loans to Bank clients [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 81 | 68
Provision, net | 1 |
Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | 515 | 517
Gains (losses) | 445 | 341
Impairment loss |  | (4)
Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 656 | 893
Gains (losses) | (2,224) | (945)
Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 74 | 174
Oil and gas, timber, agriculture and other income | 1,758 | 1,690
Gains (losses) | 173 | 484
Impairment loss | 120 | 45
Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 11,081 | 10,577
Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 2,829 | 2,810
Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | (164) | (70)
Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | (186) | 332
Insurance and investment contract liabilities and macro equity hedges [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (9,028) | 5,718
Insurance and investment contract liabilities and macro equity hedges [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (5,994) | 3,686
Insurance and investment contract liabilities and macro equity hedges [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (1,444) | 2,235
Insurance and investment contract liabilities and macro equity hedges [Member] | Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 55 | 69
Insurance and investment contract liabilities and macro equity hedges [Member] | Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (83) | 40
Insurance and investment contract liabilities and macro equity hedges [Member] | Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 449 | 350
Insurance and investment contract liabilities and macro equity hedges [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 213 | 441
Insurance and investment contract liabilities and macro equity hedges [Member] | Derivatives, including macro equity hedging program [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (2,224) | (1,103)
FVTPL [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | (2,992) | 11,954
Investment income | 6,368 | 6,918
FVTPL [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 5,432 | 5,102
Gains (losses) | (5,993) | 3,690
Impairment loss | (18) | 16
FVTPL [Member] | Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 18 | 7
Gains (losses) | (74) | 22
FVTPL [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 484 | 524
Gains (losses) | (1,596) | 2,372
FVTPL [Member] | Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 689 | 809
Gains (losses) | (2,251) | (1,029)
FVTPL [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Gains (losses) | 283 | 441
Impairment loss | 2 |
FVTPL [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 6,139 | 5,918
FVTPL [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 484 | 524
FVTPL [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 16 | 16
FVTPL [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | (271) | 460
FVTPL [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (9,360) | 5,036
FVTPL [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (6,012) | 3,694
FVTPL [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (1,454) | 2,200
FVTPL [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 357 | 329
FVTPL [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Derivatives, including macro equity hedging program [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (2,251) | (1,187)
AFS [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 1,003 | 761
Investment income | 979 | 743
AFS [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 646 | 577
Gains (losses) | (310) | (205)
Impairment loss |  | (1)
AFS [Member] | Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 250 | 153
Gains (losses) | 62 | (47)
AFS [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 72 | 79
Gains (losses) | 330 | 226
Impairment loss | 43 | (14)
AFS [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Gains (losses) |  | (7)
Impairment loss | 4 |
AFS [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 896 | 730
AFS [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 72 | 79
AFS [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | (47) | (15)
AFS [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 58 | (51)
AFS [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 24 | 18
AFS [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 18 | (8)
AFS [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 10 | 35
AFS [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (4) | (9)
Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 6,521 | 6,652
Investment income | 6,213 | 5,988
Other [Member] | Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,824 | 1,685
Gains (losses) | 56 | 69
Provision, net | 8 | (32)
Other [Member] | Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,729 | 1,553
Gains (losses) | (83) | 43
Impairment loss | 10 | 10
Other [Member] | Policy loans [member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 371 | 365
Other [Member] | Loans to Bank clients [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 81 | 68
Provision, net | 1 |
Other [Member] | Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | 515 | 517
Gains (losses) | 445 | 341
Impairment loss |  | (4)
Other [Member] | Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | (33) | 84
Gains (losses) | 27 | 84
Other [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 74 | 174
Oil and gas, timber, agriculture and other income | 1,758 | 1,690
Gains (losses) | (110) | 50
Impairment loss | 114 | 45
Other [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 4,046 | 3,929
Other [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 2,273 | 2,207
Other [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | (133) | (71)
Other [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 27 | (77)
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 308 | 664
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 55 | 69
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (83) | 40
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 449 | 350
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | (140) | 121
Other [Member] | Insurance and investment contract liabilities and macro equity hedges [Member] | Derivatives, including macro equity hedging program [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | $ 27 | $ 84

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