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PENSION AND OTHER POSTRETIREMENT BENEFITS - Benefit Obligation, Plan Assets and Funded Status (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | $ 61 |  |
Fair value of plan assets at end of year | 77 | $ 61 |
Canada | Pension |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 4,092 | 3,630 |
Service cost | 103 | 81 | $ 131
Interest cost | 186 | 184 | 127
Participant contributions | 32 | 31 |
Actuarial (gain)/loss | 0 | 359 |
Benefits paid | (210) | (193) |
Transfer in | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Projected benefit obligation at end of year | 4,203 | 4,092 | 3,630
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 4,528 | 4,234 |
Actual return on plan assets | 627 | 427 |
Employer contributions | 23 | 27 |
Participant contributions | 32 | 31 |
Benefits paid | (210) | (193) |
Transfer in | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 2 |
Fair value of plan assets at end of year | 5,000 | 4,528 | 4,234
Overfunded status at end of year | 797 | 436 |
Presented as follows: |  |  |
Deferred amounts and other assets | 943 | 636 |
Other current liabilities | (10) | (8) |
Other long-term liabilities | (136) | (192) |
Amount recognized in balance sheet | 797 | 436 |
Accumulated benefit obligation | 3,900 | 3,800 |
Canada | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 18 | 14 |
Canada | OPEB |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 228 | 211 |
Service cost | 3 | 3 | 4
Interest cost | 10 | 11 | 7
Participant contributions | 0 | 0 |
Actuarial (gain)/loss | (21) | 13 |
Benefits paid | (10) | (10) |
Transfer in | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Projected benefit obligation at end of year | 210 | 228 | 211
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 10 | 10 |
Participant contributions | 0 | 0 |
Benefits paid | (10) | (10) |
Transfer in | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 0
Overfunded status at end of year | (210) | (228) |
Presented as follows: |  |  |
Deferred amounts and other assets | 0 | 0 |
Other current liabilities | (11) | (12) |
Other long-term liabilities | (199) | (216) |
Amount recognized in balance sheet | (210) | (228) |
US |  |  |
Change in plan assets |  |  |
Employer contributions | 35 | 33 | 30
US | Pension |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 1,036 | 1,029 |
Service cost | 60 | 40 | 43
Interest cost | 69 | 47 | 24
Participant contributions | 0 | 0 |
Actuarial (gain)/loss | (98) | 31 |
Benefits paid | (100) | (76) |
Transfer in | 569 | 0 |
Foreign currency exchange rate changes | 119 | (29) |
Other | (7) | (6) |
Projected benefit obligation at end of year | 1,648 | 1,036 | 1,029
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,052 | 1,080 |
Actual return on plan assets | 197 | 78 |
Employer contributions | 5 | 5 |
Participant contributions | 0 | 0 |
Benefits paid | (100) | (76) |
Transfer in | 900 | 0 |
Foreign currency exchange rate changes | 146 | (29) |
Other | (6) | (6) |
Fair value of plan assets at end of year | 2,194 | 1,052 | 1,080
Overfunded status at end of year | 546 | 16 |
Presented as follows: |  |  |
Deferred amounts and other assets | 653 | 116 |
Other current liabilities | (6) | (5) |
Other long-term liabilities | (101) | (95) |
Amount recognized in balance sheet | 546 | 16 |
Accumulated benefit obligation | 1,600 | 1,000 |
US | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 80 | 62 |
US | OPEB |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 129 | 136 |
Service cost | 3 | 1 | 1
Interest cost | 7 | 6 | 3
Participant contributions | 5 | 5 |
Actuarial (gain)/loss | (9) | 4 |
Benefits paid | (20) | (20) |
Transfer in | 46 | 0 |
Foreign currency exchange rate changes | 16 | (3) |
Projected benefit obligation at end of year | 177 | 129 | 136
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 187 | 185 |
Actual return on plan assets | 22 | 14 |
Employer contributions | 7 | 7 |
Participant contributions | 5 | 5 |
Benefits paid | (20) | (20) |
Transfer in | 55 | 0 |
Foreign currency exchange rate changes | 20 | (4) |
Other | 2 | 0 |
Fair value of plan assets at end of year | 278 | 187 | $ 185
Overfunded status at end of year | 101 | 58 |
Presented as follows: |  |  |
Deferred amounts and other assets | 113 | 73 |
Other current liabilities | 0 | 0 |
Other long-term liabilities | (12) | (15) |
Amount recognized in balance sheet | $ 101 | $ 58 |

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