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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%