RISK MANAGEMENT AND FINANCIAL INSTRUMENTS (Details 8) - CAD CAD in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes in net fair value of derivative assets and liabilities classified as Level 3 in the fair value hierarchy
Level 3 net derivative liability at beginning of period	CAD 149	CAD (164)
Total gains/(loss)
Included in earnings	(49)	(18)
Included in OCI	(22)
Settlements	(152)	10
Level 3 net derivative liability at end of period	(74)	(172)
Amount of transfer of fair value of liabilities between levels	0	0
Net Investment Hedges unrealized translation loss on foreign exchange contracts	279	(9)
Net Investment Hedges unrealized loss on change in fair value on foreign exchange contracts	97	4
Net Investment Hedges realized gains on settlement on forward exchange contracts	7	5
Net Investment Hedges amount of ineffectiveness	0	CAD 0
Fair Value of Other Financial Instruments
Equity investments at carrying value	121		CAD 99
Investments held in trust	CAD 22		0
Preference shares \| Minimum
Fair Value of Other Financial Instruments
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds	10 years
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)	4.30%
Preference shares \| Maximum
Fair Value of Other Financial Instruments
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)	4.40%
Carrying value
Fair Value of Other Financial Instruments
Long-term debt	CAD 37,373		34,427
Carrying value \| Preference shares
Fair Value of Other Financial Instruments
Held to maturity preferred share investment	350		323
Total Gross Derivative Instruments
Fair Value of Other Financial Instruments
Long-term debt	38,484		36,637
Total Gross Derivative Instruments \| Preference shares
Fair Value of Other Financial Instruments
Held to maturity preferred share investment	CAD 580		CAD 580

Represents the percentage points added to the variable reference rate for the calculation of cumulative dividends.

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Represents the maturity period of the Government of Canada bonds that are used as the variable reference rate for the calculation of cumulative dividends.

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Represents the amount of transfer of fair value of liabilities between levels.

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Represents the amount of gain (loss) recognized in earnings, arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

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Represents assets and liabilities, net, measured at fair value using significant unobservable inputs (level 3) which is required for reconciliation purposes of beginning and ending balances.

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Represents the settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within level 3 of the fair value hierarchy.

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Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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

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Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).

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Fair value of investments in debt securities classified as held-to-maturity.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount of unrealized loss recorded in accumulated other comprehensive income pertaining to the decrease in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective.

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