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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets ) (Details) - CAD CAD in Millions	Dec. 31, 2016	Dec. 31, 2015
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current Liabilities	CAD (58)	CAD (7)
Liabilities, Noncurrent	(669)	(303)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	9	9
Pension Plan [Member]
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current Liabilities	(41)	(4)
Liabilities, Noncurrent	(367)	(224)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	9	9
Deferred Tax Assets, Defined Benefit Plan	(16)	(19)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	620	330
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	237	130
Non-pension Benefit Plans [Member
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current Liabilities	(17)	(3)
Liabilities, Noncurrent	(302)	(79)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0
Deferred Tax Assets, Defined Benefit Plan	1	3
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	45	(9)
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	CAD (275)	CAD (94)

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to defined benfit plans.

+ References

No definition available.

+ Details

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X

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (j-k)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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X

- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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- Definition

The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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X

- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Liabilities
-URI http://asc.fasb.org/extlink&oid=6509677

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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- References

No definition available.

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