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PENSION AND OTHER POSTRETIREMENT BENEFITS - Net Benefit Costs Recognized (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 131 | $ 139 | $ 148
Interest cost | 127 | 101 | 128
Expected return on plan assets | (295) | (252) | (260)
Amortization/settlement of net actuarial loss | 8 | 54 | 42
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net periodic benefit (credit)/cost | (29) | 42 | 58
Defined contribution benefit cost | 10 | 7 | 6
Net pension (credit)/cost recognized in Earnings | (19) | 49 | 64
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | (2) | (25) | (21)
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net actuarial (gain)/loss arising during the year | (288) | (291) | 118
Total amount recognized in OCI | (290) | (316) | 97
Total amount recognized in Comprehensive income | (309) | (267) | 161
Pension | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 43 | 44 | 44
Interest cost | 24 | 17 | 31
Expected return on plan assets | (85) | (73) | (88)
Amortization/settlement of net actuarial loss | 0 | 11 | 1
Amortization/curtailment of prior service credit | (2) | 0 | (1)
Net periodic benefit (credit)/cost | (20) | (1) | (13)
Defined contribution benefit cost | 0 | 0 | 0
Net pension (credit)/cost recognized in Earnings | (20) | (1) | (13)
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 0 | (11) | (1)
Amortization/curtailment of prior service credit | 2 | 0 | 1
Net actuarial (gain)/loss arising during the year | (52) | (99) | 100
Total amount recognized in OCI | (50) | (110) | 100
Total amount recognized in Comprehensive income | (70) | (111) | 87
OPEB | Canada |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 4 | 6 | 5
Interest cost | 7 | 7 | 8
Expected return on plan assets | 0 | 0 | 0
Amortization/settlement of net actuarial loss | (1) | 0 | (1)
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net pension (credit)/cost recognized in Earnings | 10 | 13 | 12
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 1 | 0 | 1
Amortization/curtailment of prior service credit | 0 | 0 | 0
Net actuarial (gain)/loss arising during the year | (67) | (50) | 21
Prior service credit | 0 | 0 | 0
Total amount recognized in OCI | (66) | (50) | 22
Total amount recognized in Comprehensive income | (56) | (37) | 34
OPEB | United States |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 1 | 2
Interest cost | 3 | 3 | 7
Expected return on plan assets | (12) | (10) | (12)
Amortization/settlement of net actuarial loss | (6) | (1) | (1)
Amortization/curtailment of prior service credit | (7) | (7) | (2)
Net pension (credit)/cost recognized in Earnings | (21) | (14) | (6)
Amount recognized in OCI: |  |  |
Amortization/settlement of net actuarial loss | 6 | 1 | 1
Amortization/curtailment of prior service credit | 7 | 7 | 2
Net actuarial (gain)/loss arising during the year | (4) | (80) | 15
Prior service credit | 0 | 0 | (33)
Total amount recognized in OCI | 9 | (72) | (15)
Total amount recognized in Comprehensive income | $ (12) | $ (86) | $ (21)

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