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Invested Assets and Investment Income - Schedule of Investment Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | $ 874 | $ 864
Net Investment income | 35,400 | 33,593
Investment income | 16,433 | 15,393
Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 6,497 | 6,340
Gains (losses) | 13,524 | 11,997
Impairment loss, net | (119) | (8)
Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 169 | 313
Gains (losses) | (136) | (18)
Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 555 | 620
Gains (losses) | 2,041 | 3,188
Impairment loss, net | (54) | (24)
Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,837 | 1,951
Gains (losses) | 86 | 26
Provision, net | (18) | 31
Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,883 | 1,782
Gains (losses) | (18) | (62)
Impairment loss, net | (88) | (35)
Policy loans [member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 390 | 391
Loans to Bank clients [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 72 | 87
Provision, net | (2) | (1)
Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | 468 | 505
Gains (losses) | (18) | 508
Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 893 | 555
Gains (losses) | 6,529 | 2,647
Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 72 | 69
Oil and gas, timber, agriculture and other income | 1,435 | 1,862
Gains (losses) | (177) | 776
Impairment loss, net | (421) |
Recovery, net |  | 93
Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 11,813 | 11,488
Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 2,458 | 2,988
Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 703 | 56
Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 2,865 | 861
Insurance and investment contract liabilities and macro equity hedges [Member] |  |
Disclosure of Investment Income [line items] |  |
Realized and unrealized gains (losses) on assets | 18,967 | 18,200
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 | 10,748 | 11,528
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 | 1,917 | 2,870
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 | 86 | 26
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 | (47) | (62)
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 | 1 | 514
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 | (215) | 748
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 | 6,477 | 2,576
FVTPL [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 26,174 | 24,720
Investment income | 7,388 | 6,976
Realized and unrealized gains (losses) on assets | 18,786 | 17,744
FVTPL [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 5,805 | 5,557
Gains (losses) | 10,739 | 11,525
Impairment loss, net | (113) | (9)
FVTPL [Member] | Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 24 | 32
Gains (losses) | (24) | 11
FVTPL [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 517 | 551
Gains (losses) | 2,020 | 3,079
FVTPL [Member] | Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 924 | 579
Gains (losses) | 6,501 | 2,653
FVTPL [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Gains (losses) | (210) | 742
Impairment loss, net | (9) |
FVTPL [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 6,753 | 6,168
FVTPL [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 517 | 552
FVTPL [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 123 | 9
FVTPL [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 241 | 265
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 | 10,747 | 11,521
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 | 1,908 | 2,865
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 | (318) | 776
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 | 6,449 | 2,582
AFS [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 3,494 | 1,661
Investment income | 3,484 | 1,649
Realized and unrealized gains (losses) on assets | 10 | 12
AFS [Member] | Debt securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 692 | 783
Gains (losses) | 2,785 | 472
Impairment loss, net | (6) | 1
AFS [Member] | Cash and short-term securities [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 145 | 281
Gains (losses) | (112) | (29)
AFS [Member] | Public equities [Member] |  |
Disclosure of Investment Income [line items] |  |
Dividend income | 38 | 69
Gains (losses) | 21 | 109
Impairment loss, net | (54) | (24)
AFS [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Gains (losses) | 1 | (1)
Impairment loss, net | (16) |
AFS [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 837 | 1,064
AFS [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 38 | 69
AFS [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 76 | 23
AFS [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 2,685 | 539
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 | 1 | 7
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 | 9 | 5
Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 5,732 | 7,212
Investment income | 5,561 | 6,768
Other [Member] | Mortgages [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,837 | 1,951
Gains (losses) | 86 | 26
Provision, net | (18) | 31
Other [Member] | Private placements [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 1,883 | 1,782
Gains (losses) | (18) | (62)
Impairment loss, net | (88) | (35)
Other [Member] | Policy loans [member] |  |
Disclosure of Investment Income [line items] |  |
Net Investment income | 390 | 391
Other [Member] | Loans to Bank clients [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 72 | 87
Provision, net | (2) | (1)
Other [Member] | Real estate [Member] |  |
Disclosure of Investment Income [line items] |  |
Rental income, net of depreciation | 468 | 505
Gains (losses) | (18) | 508
Other [Member] | Derivatives [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | (31) | (24)
Gains (losses) | 28 | (6)
Other [Member] | Other invested assets [Member] |  |
Disclosure of Investment Income [line items] |  |
Interest income | 72 | 69
Oil and gas, timber, agriculture and other income | 1,435 | 1,862
Gains (losses) | 32 | 35
Impairment loss, net | (396) |
Recovery, net |  | 93
Other [Member] | Interest income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 4,223 | 4,256
Other [Member] | Dividend, rental and other income [member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 1,903 | 2,367
Other [Member] | Impairments, provisions and recoveries, net [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 504 | 88
Other [Member] | Other [Member] |  |
Disclosure of Investment Income [line items] |  |
Investment income | 61 | 57
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 | 171 | 444
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 | 86 | 26
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 | (47) | (62)
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 | 1 | 514
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 | 103 | (28)
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 | $ 28 | $ (6)

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