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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, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 5,872 |  | 5,114 |
Canadian Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 932 |  | 811 |
Non-Canadian Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 1,911 |  | 1,657 |
Corporate Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 654 |  | 473 |
Government Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 2,161 |  | 1,982 |
Asset Backed Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value |  |  | 5 |
Mortgage Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 1 |  | 1 |
Equities - Venture Capital |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 188 |  | 158 |
Cash |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 25 |  | 27 |
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 12 |  | 9 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Cash |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 12 |  | 9 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 5,671 |  | 4,946 |
Significant Other Observable Inputs (Level 2) | Canadian Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 932 | [1] | 811 | [1]
Significant Other Observable Inputs (Level 2) | Non-Canadian Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 1,911 | [1] | 1,657 | [1]
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 654 | [2] | 473 | [2]
Significant Other Observable Inputs (Level 2) | Government Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 2,161 | [2] | 1,982 | [2]
Significant Other Observable Inputs (Level 2) | Asset Backed Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value |  |  | 5 | [2]
Significant Other Observable Inputs (Level 2) | Cash |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 13 | [3] | 18 | [3]
Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 189 |  | 159 |
Significant Unobservable Inputs (Level 3) | Mortgage Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 1 | [4] | 1 | [4]
Significant Unobservable Inputs (Level 3) | Equities - Venture Capital |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets at fair value | 188 | [5] | 158 | [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=28361610&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 + Details
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