INCOME TAXES - RATE RECONCILIATION (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME TAX RATE RECONCILIATION
Earnings before income taxes and discontinued operation	CAD 569	CAD 2,451	CAD 11
Canadian federal statutory income tax rate	15.00%	15.00%	15.00%
Expected federal taxes at statutory rate	CAD 85	CAD 368	CAD 2
Increase/(decrease) resulting from:
Provincial and state income taxes	133	34	(204)
Foreign and other statutory rate differentials	(601)	(56)	310
Impact of United States tax reform	(2,045)	0	0
Effects of rate-regulated accounting	(189)	(116)	(52)
Foreign allowable interest deductions	(124)	(107)	(84)
Part VI.1 tax, net of federal Part I deduction	68	56	55
Goodwill write-down	15	0	0
Intercompany sale of investment	0	6	23
Non-taxable portion of gain on sale of investment to unrelated party	0	(61)	0
Valuation allowance	(17)	22	154
Effective Income Tax Rate Reconciliation, Intercorporate Investments, Amount	77	0	0
Noncontrolling interests	(80)	(15)	(28)
Other	(19)	11	(6)
Income taxes on earnings before discontinued operations	CAD (2,697)	CAD 142	CAD 170
Effective income tax rate (as a percent)	(474.00%)	5.80%	1545.50%
Federal component of tax expense (recovery) of adjustments related to prior periods			CAD (17)

Effective Income Tax Rate Reconciliation, Intercorporate Investments, Amount

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amount

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Effective Income Tax Reconciliation, Goodwill Write-Down, Amount

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to taxes on preferred dividends paid, net of allowable deductions.

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Represents the portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations that is attributable to intercompany sale of investments.

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Represents the amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit) and other statutory income tax rates.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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