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accounting policy developments - Impacts of application of IFRS 9 on carrying amount of portfolio investments (Details) - Financial assets at fair value - CAD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2017
Disclosure of initial application of standards or interpretations
Assets	$ 41	$ 62
As previously reported
Disclosure of initial application of standards or interpretations
Assets	41	62
IFRS 9 effects
Disclosure of initial application of standards or interpretations
Portfolio investments accounted for at fair value through net income that have been adjusted to retained earnings from accumulated other comprehensive income	4	3
Income tax on portfolio investments accounted for at fair value adjusted to retained earnings	1	1
Available-for-sale financial assets | As previously reported
Disclosure of initial application of standards or interpretations
Assets	41	62
Available-for-sale financial assets | IFRS 9 effects
Disclosure of initial application of standards or interpretations
Assets	(41)	(62)
Fair value through net income
Disclosure of initial application of standards or interpretations
Assets	20	41
Fair value through net income | IFRS 9 effects
Disclosure of initial application of standards or interpretations
Assets	20	41
Fair value through other comprehensive income
Disclosure of initial application of standards or interpretations
Assets	21	21
Fair value through other comprehensive income | IFRS 9 effects
Disclosure of initial application of standards or interpretations
Assets	$ 21	$ 21

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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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The amount of financial assets classified as measured at fair value through profit or loss that have been adjusted to retained earnings from accumulated other comprehensive income.

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The amount of income tax effect on financial assets classified as measured at fair value through profit or loss that have been adjusted to retained earnings from accumulated other comprehensive income.

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