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Fair Value of Pension Plan Assets Including Level Within Fair Value Hierarchy (Detail) (CAD)
In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

6,807us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

5,872us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

Canadian Equity Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Non-Canadian Equity Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Corporate Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Government Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Asset Backed Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Mortgage Funds

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Equities - Venture Capital

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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188us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Quoted Prices In Active Markets For Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Quoted Prices In Active Markets For Identical Assets (Level 1) | Cash

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Significant Other Observable Inputs (Level 2)

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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Significant Other Observable Inputs (Level 2) | Canadian Equity Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[1]

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^[1]

Significant Other Observable Inputs (Level 2) | Non-Canadian Equity Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[1]

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^[1]

Significant Other Observable Inputs (Level 2) | Corporate Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[2]

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^[2]

Significant Other Observable Inputs (Level 2) | Government Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

3,033us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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^[2]

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^[2]

Significant Other Observable Inputs (Level 2) | Asset Backed Debt Securities

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[2]

Significant Other Observable Inputs (Level 2) | Cash

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[3]

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^[3]

Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

211us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member

189us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_FairValueInputsLevel3Member

Significant Unobservable Inputs (Level 3) | Mortgage Funds

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[4]

Significant Unobservable Inputs (Level 3) | Equities - Venture Capital

Defined Benefit Plan Disclosure [Line Items]

Total plan assets at fair value

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^[5]

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^[5]

[1]	For company equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.
[2]	For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.
[3]	For cash balances that are held in Level 2 funds prior to investment in those fund units, the cash value is treated as a Level 2 input.
[4]	For mortgage funds, fair value represents the principal outstanding which is guaranteed by Canada Mortgage and Housing Corporation.
[5]	For venture capital partnership investments, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: 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=35743120&loc=d3e1928-114920



Reference 2: 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=29635418&loc=d3e12355-114930

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