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PENSION AND OTHER POSTRETIREMENT BENEFITS - NET BENEFIT COSTS RECOGNIZED (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 139 | $ 148 | $ 149
Interest cost | 101 | 128 | 139
Expected return on plan assets | (252) | (260) | (245)
Amortization/settlement of net actuarial loss | 54 | 42 | 41
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net periodic benefit (credit)/cost | 42 | 58 | 84
Defined contribution benefit cost | 7 | 6 | 8
Net pension (credit)/cost recognized in Earnings | 49 | 64 | 92
Amount recognized in OCI: |  |  |
Effect of plan combination | 0 | 0 | 0
Amortization/settlement of net actuarial loss | (25) | (21) | (26)
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net actuarial (gain)/loss arising during the year | (291) | 118 | 115
Total amount recognized in OCI | (316) | 97 | 89
Total amount recognized in Comprehensive income | (267) | 161 | 181
Pension | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 44 | 44 | 45
Interest cost | 17 | 31 | 41
Expected return on plan assets | (73) | (88) | (78)
Amortization/settlement of net actuarial loss | 11 | 1 | 2
Amortization/curtailment of prior service credit | 0 | (1) | (1)
Net periodic benefit (credit)/cost | (1) | (13) | 9
Defined contribution benefit cost | 0 | 0 | 0
Net pension (credit)/cost recognized in Earnings | (1) | (13) | 9
Amount recognized in OCI: |  |  |
Effect of plan combination | 0 | 0 | (6)
Amortization/settlement of net actuarial loss | (11) | (1) | (2)
Amortization/curtailment of prior service credit | 0 | 1 | 1
Net actuarial (gain)/loss arising during the year | (99) | 100 | 8
Total amount recognized in OCI | (110) | 100 | 1
Total amount recognized in Comprehensive income | (111) | 87 | 10
OPEB | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 6 | 5 | 5
Interest cost | 7 | 8 | 10
Expected return on plan assets | 0 | 0 | 0
Amortization/settlement of net actuarial loss | 0 | (1) | (7)
Amortization/curtailment of prior service credit | 0 | 0 | (1)
Net pension (credit)/cost recognized in Earnings | 13 | 12 | 7
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 0 | 1 | 7
Amortization/curtailment of prior service credit | 0 | 0 | 1
Net actuarial (gain)/loss arising during the year | (50) | 21 | 15
Prior service credit | 0 | 0 | 0
Total amount recognized in OCI | (50) | 22 | 23
Total amount recognized in Comprehensive income | (37) | 34 | 30
OPEB | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 2 | 2
Interest cost | 3 | 7 | 10
Expected return on plan assets | (10) | (12) | (12)
Amortization/settlement of net actuarial loss | (1) | (1) | 0
Amortization/curtailment of prior service credit | (7) | (2) | (2)
Net pension (credit)/cost recognized in Earnings | (14) | (6) | (2)
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 1 | 1 | 0
Amortization/curtailment of prior service credit | 7 | 2 | 2
Net actuarial (gain)/loss arising during the year | (80) | 15 | (8)
Prior service credit | 0 | (33) | 0
Total amount recognized in OCI | (72) | (15) | (6)
Total amount recognized in Comprehensive income | $ (86) | $ (21) | $ (8)

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