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Employee Future Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension defined benefit plans [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	$ 4,675	$ 4,706
Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	640	665
U.S. plans [Member] | Pension defined benefit plans [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	3,052	3,026
U.S. plans [Member] | Pension defined benefit plans [member] | Active [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	621	592
U.S. plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	2,431	2,434
U.S. plans [Member] | Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	489	515
U.S. plans [Member] | Retiree welfare plans [Member] | Active [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	32	34
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	457	481
Canadian plans [Member] | Pension defined benefit plans [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	1,623	1,680
Canadian plans [Member] | Pension defined benefit plans [member] | Active [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	332	393
Canadian plans [Member] | Pension defined benefit plans [member] | Inactive and retired members [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	1,291	1,287
Canadian plans [Member] | Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	151	150
Canadian plans [Member] | Retiree welfare plans [Member] | Active [member]
Disclosure of defined benefit plans [Line Items]
Disaggregation of defined benefit obligation	22	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	$ 129	$ 130

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 2018-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2018-03-16

+ 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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