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PENSION AND OTHER POSTRETIREMENT BENEFITS - NET BENEFIT COSTS RECOGNIZED (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 149 | $ 149 | $ 156
Interest cost | 139 | 130 | 116
Expected return on plan assets | (245) | (245) | (201)
Amortization/settlement of net actuarial loss | 41 | 25 | 29
Amortization/curtailment of prior service (credit)/cost | 0 | 0 | 0
Net periodic benefit cost | 84 | 59 | 100
Defined contribution benefit cost | 8 | 11 | 11
Net pension cost recognized in Earnings | 92 | 70 | 111
Amount recognized in OCI: |  |  |
Effect of plan combination | 0 | 0 | 0
Amortization/settlement of net actuarial loss | (26) | (11) | (14)
Amortization/curtailment of prior service credit/(cost) | 0 | 0 | 0
Net actuarial loss arising during the year | 115 | 112 | 38
Total amount recognized in OCI | 89 | 101 | 24
Total amount recognized in Comprehensive income | 181 | 171 | 135
Expected amortization, next fiscal year | 21 |  |
Pension | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 45 | 45 | 48
Interest cost | 41 | 38 | 35
Expected return on plan assets | (78) | (88) | (57)
Amortization/settlement of net actuarial loss | 2 | 7 | 10
Amortization/curtailment of prior service (credit)/cost | (1) | 3 | 0
Net periodic benefit cost | 9 | 5 | 36
Defined contribution benefit cost | 0 | 0 | 0
Net pension cost recognized in Earnings | 9 | 5 | 36
Amount recognized in OCI: |  |  |
Effect of plan combination | (6) | 0 | 0
Amortization/settlement of net actuarial loss | (2) | (7) | (9)
Amortization/curtailment of prior service credit/(cost) | 1 | (3) | 0
Net actuarial loss arising during the year | 8 | 28 | 0
Total amount recognized in OCI | 1 | 18 | (9)
Total amount recognized in Comprehensive income | 10 | 23 | 27
Expected amortization, next fiscal year | 0 |  |
OPEB | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 5 | 8 | 7
Interest cost | 10 | 10 | 10
Expected return on plan assets | 0 | 0 | 0
Amortization/settlement of net actuarial loss | (7) | 0 | 0
Amortization/curtailment of prior service (credit)/cost | (1) | 0 | 1
Net pension cost recognized in Earnings | 7 | 18 | 18
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 7 | 0 | (1)
Amortization/curtailment of prior service credit/(cost) | 1 | 0 | 0
Net actuarial loss arising during the year | 15 | (46) | (8)
Prior service (credit)/cost | 0 | 0 | (3)
Total amount recognized in OCI | 23 | (46) | (12)
Total amount recognized in Comprehensive income | 30 | (28) | 6
Expected amortization, next fiscal year | 1 |  |
OPEB | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2 | 3 | 5
Interest cost | 10 | 10 | 10
Expected return on plan assets | (12) | (12) | (10)
Amortization/settlement of net actuarial loss | 0 | (1) | 0
Amortization/curtailment of prior service (credit)/cost | (2) | (4) | 0
Net pension cost recognized in Earnings | (2) | (4) | 5
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 0 | 1 | 1
Amortization/curtailment of prior service credit/(cost) | 2 | 4 | 0
Net actuarial loss arising during the year | (8) | (1) | (42)
Prior service (credit)/cost | 0 | (8) | 1
Total amount recognized in OCI | (6) | (4) | (40)
Total amount recognized in Comprehensive income | (8) | $ (8) | $ (35)
Expected amortization, next fiscal year | $ 3 |  |

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