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RETIREMENT AND POSTRETIREMENT BENEFITS - NET BENEFIT COSTS RECOGNIZED (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted average assumptions made in the measurement of the cost of the pension plans and OPEB |  |  |
Offsetting regulatory liabilities | CAD 0 | CAD 3 |
Other Postretirement Plans |  |  |
Net Benefit Costs Recognized |  |  |
Benefits earned during the period | 8 | 8 | CAD 9
Interest cost on projected benefit obligations | 11 | 12 | 11
Expected return on plan assets | (6) | (5) | (4)
Amortization of actuarial loss | 1 |  | 2
Net benefit costs on an accrual basis | 14 | 15 | 18
Pension and Other Postretirement Benefit Expense, Total | 14 | 15 | 18
Amount included in AOCI |  |  |
Net actuarial (gains)/loss | 16 | 15 | (45)
Net prior service costs/(credit) | (6) |  | 2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Total | 10 | 15 | (43)
Total amount recognized in Comprehensive income | 24 | 30 | CAD (25)
Amount included in AOCI |  |  |
Unamortized actuarial losses included in AOCI | (44) | (26) |
Unamortized prior services costs (credits) included in AOCI | (1) | CAD 6 |
Amount reclassified into earnings in the next twelve months |  |  |
Actuarial Loss | CAD 1 |  |
Weighted average assumptions made in the measurement of the cost of the pension plans and OPEB |  |  |
Discount rate (as a percent) | 3.90% | 4.90% | 4.00%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Actual Long Term Return On Assets | 6.00% | 6.00% | 6.00%
Pension Plans |  |  |
Net Benefit Costs Recognized |  |  |
Benefits earned during the period | CAD 167 | CAD 108 | CAD 103
Interest cost on projected benefit obligations | 98 | 93 | 79
Expected return on plan assets | (142) | (123) | (103)
Amortization of prior service costs |  |  | 1
Amortization of actuarial loss | 49 | 28 | 52
Net benefit costs on an accrual basis | 172 | 106 | 132
Defined contribution benefit costs | 4 | 4 | 4
Pension and Other Postretirement Benefit Expense, Total | 176 | 110 | 136
Amount included in AOCI |  |  |
Net actuarial (gains)/loss | (107) | 232 | (158)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Total | (107) | 232 | (158)
Total amount recognized in Comprehensive income | 69 | 342 | CAD (22)
Amount included in AOCI |  |  |
Unamortized actuarial losses included in AOCI | (404) | CAD (489) |
Amount reclassified into earnings in the next twelve months |  |  |
Actuarial Loss | CAD 35 |  |
Weighted average assumptions made in the measurement of the cost of the pension plans and OPEB |  |  |
Discount rate (as a percent) | 4.00% | 5.00% | 4.20%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Actual Long Term Return On Assets | 6.70% | 6.70% | 6.70%
Average rate of salary increases (as a percent) | 4.00% | 3.70% | 3.70%

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- Definition The actual rate of return on plan assets reflecting the average rate of earnings on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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