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PENSION AND OTHER POSTRETIREMENT BENEFITS - NET BENEFIT COSTS RECOGNIZED (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 149 | $ 156 | $ 129
Interest cost | 130 | 116 | 73
Expected return on plan assets | (245) | (201) | (127)
Amortization/settlement of net actuarial loss | 25 | 29 | 32
Amortization/curtailment of prior service cost | 0 | 0 | 0
Net defined benefit costs | 59 | 100 | 107
Defined contribution benefit costs | 11 | 11 | 3
Net benefit cost recognized in Earnings | 70 | 111 | 110
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | (11) | (14) | (14)
Amortization/curtailment of prior service cost | 0 | 0 | 0
Net actuarial loss arising during the year | 112 | 38 | 28
Total amount recognized in OCI | 101 | 24 | 14
Total amount recognized in Comprehensive income | 171 | 135 | 124
Expected amortization, next fiscal year | 32 |  |
Pension | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 45 | 48 | 26
Interest cost | 38 | 35 | 16
Expected return on plan assets | (88) | (57) | (21)
Amortization/settlement of net actuarial loss | 7 | 10 | 3
Amortization/curtailment of prior service cost | 3 | 0 | 0
Net defined benefit costs | 5 | 36 | 24
Defined contribution benefit costs | 19 | 15 | 0
Net benefit cost recognized in Earnings | 24 | 51 | 24
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | (7) | (9) | (6)
Amortization/curtailment of prior service cost | (3) | 0 | 0
Net actuarial loss arising during the year | 28 | 0 | 16
Total amount recognized in OCI | 18 | (9) | 10
Total amount recognized in Comprehensive income | 42 | 42 | 34
Expected amortization, next fiscal year | 0 |  |
OPEB | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 8 | 7 | 4
Interest cost | 10 | 10 | 6
Expected return on plan assets | 0 | 0 | 0
Amortization/settlement of net actuarial loss | 0 | 0 | 0
Amortization/curtailment of prior service cost | 0 | 1 | 0
Net benefit cost recognized in Earnings | 18 | 18 | 10
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 0 | (1) | (1)
Amortization/curtailment of prior service cost | 0 | 0 | 0
Net actuarial loss arising during the year | (46) | (8) | 2
Prior service (credit)/cost | 0 | (3) | 0
Total amount recognized in OCI | (46) | (12) | 1
Total amount recognized in Comprehensive income | (28) | 6 | 11
Expected amortization, next fiscal year | 0 |  |
OPEB | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 3 | 5 | 4
Interest cost | 10 | 10 | 5
Expected return on plan assets | (12) | (10) | (6)
Amortization/settlement of net actuarial loss | (1) | 0 | 0
Amortization/curtailment of prior service cost | (4) | 0 | 0
Net benefit cost recognized in Earnings | (4) | 5 | 3
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 1 | 1 | (1)
Amortization/curtailment of prior service cost | 4 | 0 | 0
Net actuarial loss arising during the year | (1) | (42) | 12
Prior service (credit)/cost | (8) | 1 | (12)
Total amount recognized in OCI | (4) | (40) | (1)
Total amount recognized in Comprehensive income | (8) | $ (35) | $ 2
Expected amortization, next fiscal year | $ 2 |  |

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