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Risk Management - Summary of Credit Quality and Carrying Value of Commercial Mortgages and Private Placements (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	CAD 25,574	CAD 25,728
Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	8,141	8,199
Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	7,709	7,324
Commercial mortgages [Member] | Multi-family residential [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	4,449	4,806
Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	2,583	2,834
Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	2,692	2,565
Agricultural mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	589	822
Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	32,132	29,729
Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	58,295	56,279
AAA [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,085	1,271
AAA [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	110	97
AAA [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	57	68
AAA [Member] | Commercial mortgages [Member] | Multi-family residential [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	523	656
AAA [Member] | Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	33	22
AAA [Member] | Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	362	428
AAA [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,038	1,086
AAA [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	2,123	2,357
AA [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	4,901	4,858
AA [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,517	1,620
AA [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,272	1,255
AA [Member] | Commercial mortgages [Member] | Multi-family residential [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,395	1,362
AA [Member] | Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	386	360
AA [Member] | Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	331	261
AA [Member] | Agricultural mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	159	151
AA [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	4,246	4,466
AA [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	9,306	9,475
A [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	13,357	13,082
A [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	4,363	4,391
A [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	4,635	3,972
A [Member] | Commercial mortgages [Member] | Multi-family residential [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,805	1,944
A [Member] | Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,542	1,452
A [Member] | Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,012	1,323
A [Member] | Agricultural mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value		61
A [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	11,978	10,671
A [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	25,335	23,814
BBB [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	5,873	6,190
BBB [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	2,050	2,084
BBB [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,647	1,938
BBB [Member] | Commercial mortgages [Member] | Multi-family residential [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	726	844
BBB [Member] | Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	477	831
BBB [Member] | Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	973	493
BBB [Member] | Agricultural mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	405	469
BBB [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	13,160	11,606
BBB [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	19,438	18,265
BB [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	273	284
BB [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	44
BB [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	70	55
BB [Member] | Commercial mortgages [Member] | Industrial [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	145	169
BB [Member] | Commercial mortgages [Member] | Other [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	14	60
BB [Member] | Agricultural mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	25	141
BB [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	717	936
BB [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	1,015	1,361
B and lower [Member] | Commercial mortgages [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	85	43
B and lower [Member] | Commercial mortgages [Member] | Retail [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	57	7
B and lower [Member] | Commercial mortgages [Member] | Office [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	28	36
B and lower [Member] | Private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	993	964
B and lower [Member] | Commercial mortgages and private placements [Member]
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items]
Credit quality and carrying value	CAD 1,078	CAD 1,007

X

- Definition

The amount of credit exposure that has been rated by external rating agencies. [Refer: Credit exposure]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2018-01-01
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-IssueDate 2017-01-01
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 36
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_c&doctype=Standard&book=B
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- Definition

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+ References

No definition available.

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