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Employee Future Benefits - Schedule of Allocation of Plan Assets (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
2016 Target Allocation (percent)	100.00%
Actual Plan Asset Allocations (percent)	100.00%	100.00%
Fair value of plan assets	CAD 2,898	CAD 2,647
Equities
Defined Benefit Plan Disclosure [Line Items]
2016 Target Allocation (percent)	50.00%
Actual Plan Asset Allocations (percent)	50.00%	51.00%
Fair value of plan assets	CAD 1,449	CAD 1,339
Fixed income
Defined Benefit Plan Disclosure [Line Items]
2016 Target Allocation (percent)	46.00%
Actual Plan Asset Allocations (percent)	45.00%	44.00%
Fair value of plan assets	CAD 1,304	CAD 1,166
Real estate
Defined Benefit Plan Disclosure [Line Items]
2016 Target Allocation (percent)	4.00%
Actual Plan Asset Allocations (percent)	4.00%	4.00%
Fair value of plan assets	CAD 116	CAD 111
Private equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	CAD 10	CAD 10
Cash and other
Defined Benefit Plan Disclosure [Line Items]
2016 Target Allocation (percent)	0.00%
Actual Plan Asset Allocations (percent)	1.00%	1.00%
Fair value of plan assets	CAD 19	CAD 21
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	637	420
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	507	417
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	124	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Private equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	3
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,148	2,120
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	942	922
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,180	1,166
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Level 2 | Private equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	18
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	113	107	CAD 93
Level 3 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	103	97
Level 3 | Private equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	10
Level 3 | Cash and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	CAD 0	CAD 0

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- Definition

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

+ References

No definition available.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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