POST-EMPLOYMENT BENEFITS - Narrative (Details) CAD in Millions	12 Months Ended
Dec. 31, 2017 CAD year	Dec. 31, 2016 CAD year
Employee Benefits [Abstract]
Defined contribution plan expense	CAD 6	CAD 3
Entity's own securities included in plan assets	7	CAD 2
Estimate of contributions expected to be paid to plan for next annual reporting period	CAD 141
Weighted average duration of defined benefit obligation \| year	19	19
Return on plan assets	CAD 160	CAD 97
Cumulative loss in equity, employee benefit plans	CAD 425	CAD 380

The fair value of the entity's own transferable financial instruments that are included in the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Financial instruments, class [member]; Defined benefit plans [member]]

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]]

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

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Cumulative Gain (Loss) In Equity, Employee Benefit Plans

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Employee Benefits [Abstract]

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