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Insurance Contract Liabilities and Reinsurance Assets - Summary of Carrying Value of Assets Backing Net Insurance Contract Liabilities, Other Liabilities and Capital (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | $ 880,349 | $ 809,130
Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 50,207 | 49,376
Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 40,756 | 37,979
Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 12,832 | 12,928
Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 218,725 | 198,122
Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 23,722 | 22,851
Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 534,107 | 487,874
Individual insurance participating [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 76,480 | 66,817
Individual insurance participating [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 3,069 | 2,921
Individual insurance participating [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 5,549 | 4,658
Individual insurance participating [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 3,385 | 3,336
Individual insurance participating [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 39,523 | 34,169
Individual insurance participating [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 12,365 | 10,907
Individual insurance participating [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 12,589 | 10,826
Individual insurance non-participating [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 148,715 | 138,096
Individual insurance non-participating [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 12,536 | 12,140
Individual insurance non-participating [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 17,276 | 16,020
Individual insurance non-participating [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 6,466 | 6,446
Individual insurance non-participating [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 81,548 | 74,113
Individual insurance non-participating [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 6,971 | 6,453
Individual insurance non-participating [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 23,918 | 22,924
Annuities and pensions [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 41,902 | 38,585
Annuities and pensions [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 4,923 | 5,203
Annuities and pensions [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 7,499 | 6,957
Annuities and pensions [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 1,027 | 1,082
Annuities and pensions [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 20,936 | 19,865
Annuities and pensions [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 461 | 204
Annuities and pensions [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 7,056 | 5,274
Other insurance contract liabilities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 72,688 | 66,310
Other insurance contract liabilities [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 8,315 | 7,916
Other insurance contract liabilities [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 9,439 | 9,122
Other insurance contract liabilities [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 1,697 | 1,731
Other insurance contract liabilities [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 34,725 | 31,620
Other insurance contract liabilities [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 310 | 253
Other insurance contract liabilities [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 18,202 | 15,668
Other Liabilities [member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 479,500 | 441,953
Other Liabilities [member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 21,338 | 21,165
Other Liabilities [member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 817 | 1,090
Other Liabilities [member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 57 | 113
Other Liabilities [member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 8,872 | 8,828
Other Liabilities [member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 402 | 381
Other Liabilities [member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 448,014 | 410,376
Capital [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 61,064 | 57,369
Capital [Member] | Mortgages [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 26 | 31
Capital [Member] | Private placements [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 176 | 132
Capital [Member] | Real estate [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 200 | 220
Capital [Member] | Debt securities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 33,121 | 29,527
Capital [Member] | Public equities [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | 3,213 | 4,653
Capital [Member] | Other [Member] |  |
Disclosure Of Carrying Value Measurement Of Assets [Line Items] |  |
Carrying value of total assets | $ 24,328 | $ 22,806

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