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Employee Future Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	CAD 4,706	CAD 4,767
Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	665	682
U.S. plans [Member] | Pension plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	3,026	3,165
U.S. plans [Member] | Pension plans [Member] | Active [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	592	637
U.S. plans [Member] | Pension plans [Member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	2,434	2,528
U.S. plans [Member] | Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	515	540
U.S. plans [Member] | Retiree welfare plans [Member] | Active [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	34	38
U.S. plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	481	502
Canadian plans [Member] | Pension plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	1,680	1,602
Canadian plans [Member] | Pension plans [Member] | Active [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	393	403
Canadian plans [Member] | Pension plans [Member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	1,287	1,199
Canadian plans [Member] | Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	150	142
Canadian plans [Member] | Retiree welfare plans [Member] | Active [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	20	20
Canadian plans [Member] | Retiree welfare plans [Member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	CAD 130	CAD 122

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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