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Employee Future Benefits - Schedule of Amounts Recognized in Balance Sheet (Details) - CAD CAD in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plans
Assets
Long-term other assets (Note 9)	CAD 32	CAD 11
Liabilities
Current (Note 13)	13	5
Long-term other liabilities (Note 16)	410	368
Net liabilities	391	362
OPEB Plans
Liabilities
Current (Note 13)	13	8
Long-term other liabilities (Note 16)	411	385
Net liabilities	CAD 424	CAD 393

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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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

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- 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
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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
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