Fair Value Measurements - Summary of Fair Values of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Derivative instruments and embedded derivatives	CAD 12	CAD 1
Recurring Fair Value Measurement [member]
Disclosure of fair value measurement of assets [line items]
Cash equivalents	722	1,153
Marketable equity securities	94	95
Debt securities	71	79
Settlements receivable	687	631
Derivative instruments and embedded derivatives	126	142
Financial assets	1,700	2,100
Level 1 [member] \| Recurring Fair Value Measurement [member]
Disclosure of fair value measurement of assets [line items]
Cash equivalents	722	1,153
Marketable equity securities	94	95
Debt securities	67	68
Financial assets	883	1,316
Level 2 [member] \| Recurring Fair Value Measurement [member]
Disclosure of fair value measurement of assets [line items]
Settlements receivable	687	631
Derivative instruments and embedded derivatives	126	142
Financial assets	813	773
Level 3 [member] \| Recurring Fair Value Measurement [member]
Disclosure of fair value measurement of assets [line items]
Debt securities	4	11
Financial assets	CAD 4	CAD 11

The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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Fair value measurements debt securities.

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Fair value measurements marketable equity securities.

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Settlements receivable.

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