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Insurance Contract Liabilities and Reinsurance Assets - Summary of Carrying Value of Total Assets Backing Net Insurance Contract Liabilities, Other Liabilities and Capital (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	CAD 729,533	CAD 720,681
Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	44,742	44,193
Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	32,132	29,729
Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	13,810	14,132
Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	174,000	168,622
Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	21,545	19,496
Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	443,304	444,509
Individual insurance participating [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	52,438	49,913
Individual insurance participating [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	2,017	2,110
Individual insurance participating [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	3,645	3,277
Individual insurance participating [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	2,963	2,811
Individual insurance participating [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	27,946	27,473
Individual insurance participating [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	9,264	8,055
Individual insurance participating [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	6,603	6,187
Individual insurance non-participating [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	113,880	106,240
Individual insurance non-participating [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	10,286	10,008
Individual insurance non-participating [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	12,128	10,823
Individual insurance non-participating [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	6,198	6,397
Individual insurance non-participating [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	63,128	56,765
Individual insurance non-participating [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	5,855	5,401
Individual insurance non-participating [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	16,285	16,846
Annuities and pensions [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	49,716	51,810
Annuities and pensions [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	7,009	8,135
Annuities and pensions [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	8,059	7,096
Annuities and pensions [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	1,136	1,480
Annuities and pensions [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	26,621	26,331
Annuities and pensions [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	171	213
Annuities and pensions [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	6,720	8,555
Other insurance contract liabilities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	58,212	54,590
Other insurance contract liabilities [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	6,891	5,554
Other insurance contract liabilities [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	7,739	7,070
Other insurance contract liabilities [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	2,516	2,561
Other insurance contract liabilities [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	25,211	23,012
Other insurance contract liabilities [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	332	351
Other insurance contract liabilities [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	15,523	16,042
Other liabilities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	404,628	407,893
Other liabilities [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	18,476	18,311
Other liabilities [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	367	1,272
Other liabilities [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	769	613
Other liabilities [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	6,635	9,965
Other liabilities [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	1,029	732
Other liabilities [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	377,352	377,000
Capital [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	50,659	50,235
Capital [Member] | Mortgages [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	63	75
Capital [Member] | Private placements [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	194	191
Capital [Member] | Real estate [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	228	270
Capital [Member] | Debt securities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	24,459	25,076
Capital [Member] | Public equities [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	4,894	4,744
Capital [Member] | Other [Member]
Disclosure Of Carrying Value Measurement Of Assets [Line Items]
Carrying value of total assets	CAD 20,821	CAD 19,879

X

- Definition

The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

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