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POST-EMPLOYMENT BENEFITS - Changes in Defined Benefit Liability (Asset) (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | CAD 62 |
Remeasurements, return on plan assets recognized in other comprehensive income (loss) and equity | 160 | CAD 97
Net defined benefit liability (asset), ending balance | 66 | 62
Domestic defined benefit plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 387 |
Interest cost (income) | (9) | (7)
Pension expense included in employee salaries and benefits expense | (150) | (129)
Remeasurements, return on plan assets recognized in other comprehensive income (loss) and equity | 92 | 32
Remeasurements, change in asset ceiling (excluding interest income) | 0 | 3
Remeasuremens gain (loss), recognized in other comprehensive (loss) income and equity | 60 | 99
Administrative expenses paid from plan assets | (4) | (3)
Net defined benefit liability (asset), ending balance | 452 | 387
Domestic defined benefit plans | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | (1,619) | (1,432)
Interest cost (income) | 72 | 68
Remeasurements, return on plan assets recognized in other comprehensive income (loss) and equity | 92 | 32
Contributions by employees, (decrease) increase | 42 | 35
Contributions by employer, (decrease) increase | 145 | 125
Benefits paid, decrease (increase) | (76) | (70)
Administrative expenses paid from plan assets | (4) | (3)
Net defined benefit liability (asset), ending balance | (1,890) | (1,619)
Domestic defined benefit plans | Accrued benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 2,006 | 1,713
Service cost | 137 | 119
Interest cost (income) | (81) | (75)
Remeasuremens gain (loss), recognized in other comprehensive (loss) income and equity | 152 | 134
Net defined benefit liability (asset), ending balance | 2,342 | 2,006
Domestic defined benefit plans | Asset ceiling |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 0 | 3
Interest cost (income) | 0 | 0
Remeasurements, change in asset ceiling (excluding interest income) | 0 | 3
Net defined benefit liability (asset), ending balance | 0 | 0
Unfunded supplemental benefits for certain executives | Accrued benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 62 | 56
Interest cost (income) | (3) | (2)
Pension expense included in employee salaries and benefits expense | 2 | 5
Benefits paid, decrease (increase) | (3) | (3)
Remeasuremens gain (loss), recognized in other comprehensive (loss) income and equity | 2 | 2
Net defined benefit liability (asset), ending balance | CAD 66 | CAD 62

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_5&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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