INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
UNRECOGNIZED TAX BENEFITS
Unrecognized tax benefits at beginning of year	$ 150	$ 84
Gross increases for tax positions of current year	2	15
Gross increases for tax positions of prior year	0	65
Gross decreases for tax positions of prior year	(12)	0
Change in translation of foreign currency	3	(2)
Lapses of statute of limitations	(3)	(8)
Settlements	(1)	(4)
Unrecognized tax benefits at end of year	139	150
Interest and penalties expense (recovery) related to unrecognized tax benefits	5	3
Accrued interest and penalties related to unrecognized tax benefits	$ 12	$ 8

Amount of increase (decrease) in unrecognized tax benefits resulting from foreign currency translation.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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