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RETIREMENT AND POSTRETIREMENT BENEFITS - NET BENEFITS COSTS RECOGNIZED (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Amount included in AOCI |  |  |
Increase in offsetting regulatory liability | CAD 10 | CAD 0 |
Pension |  |  |
Net Benefit Costs Recognized |  |  |
Benefits earned during the year | 155 | 167 | CAD 108
Interest cost on projected benefit obligations | 89 | 98 | 93
Expected return on plan assets | (148) | (142) | (123)
Amortization of actuarial loss | 35 | 49 | 28
Net defined benefit costs on an accrual basis | 131 | 172 | 106
Defined contribution benefit costs | 3 | 4 | 4
Net benefit cost recognized in Earnings | 134 | 176 | 110
Amount recognized in OCI |  |  |
Net actuarial (gains)/loss | 24 | (107) | 232
Total amount recognized in OCI | 24 | (107) | 232
Total amount recognized in Comprehensive income | 158 | 69 | CAD 342
Amount included in AOCI |  |  |
Unamortized actuarial losses included in AOCI | (425) | CAD (404) |
Estimated amount to be reclassified from AOCI into earnings in the next twelve months | CAD 36 |  |
Weighted average assumptions made in the measurement of the cost of the pension plans and OPEB |  |  |
Discount rate - service cost (as a percent) | 4.10% | 4.00% | 5.00%
Discount rate - interest cost (as a percent) | 4.10% | 4.00% | 5.00%
Average rate of return on plan assets (as a percent) | 6.60% | 6.70% | 6.70%
Average rate of salary increases (as a percent) | 3.60% | 4.00% | 3.70%
OPEB |  |  |
Net Benefit Costs Recognized |  |  |
Benefits earned during the year | CAD 8 | CAD 8 | CAD 8
Interest cost on projected benefit obligations | 11 | 11 | 12
Expected return on plan assets | (6) | (6) | (5)
Amortization of prior service costs | (1) |  |
Amortization of actuarial loss | 1 | 1 |
Net defined benefit costs on an accrual basis | 13 | 14 | 15
Net benefit cost recognized in Earnings | 13 | 14 | 15
Amount recognized in OCI |  |  |
Net actuarial (gains)/loss | 12 | 16 | 15
Net prior service credit | (12) | (6) |
Total amount recognized in OCI |  | 10 | 15
Total amount recognized in Comprehensive income | 13 | 24 | CAD 30
Amount included in AOCI |  |  |
Unamortized actuarial losses included in AOCI | (54) | (44) |
Unamortized prior service credits included in AOCI | 13 | CAD 1 |
Estimated amount to be reclassified from AOCI into earnings in the next twelve months | CAD 1 |  |
Weighted average assumptions made in the measurement of the cost of the pension plans and OPEB |  |  |
Discount rate - service cost (as a percent) | 4.20% | 3.90% | 4.90%
Discount rate - interest cost (as a percent) | 4.20% | 3.90% | 4.90%
Average rate of return on plan assets (as a percent) | 6.00% | 6.00% | 6.00%

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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=65897934&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 Amount included in accumulated other comprehensive income (AOCI) 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, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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=65897934&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=65897934&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=65897934&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=65897934&loc=d3e1928-114920 + Details
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