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PENSION AND OTHER POSTRETIREMENT BENEFITS - Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 32 |
Fair value of plan assets at end of year | $ 61 | $ 32
Canada | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 46.00% |
Plan asset allocations | 41.40% | 38.20%
Canada | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 23.20% |
Plan asset allocations | 29.60% | 31.70%
Canada | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 30.80% |
Plan asset allocations | 29.00% | 30.10%
Canada | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 4,234 | $ 4,536
Fair value of plan assets at end of year | 4,528 | 4,234
Canada | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 473 |
Fair value of plan assets at end of year | 227 | 473
Canada | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,470 |
Fair value of plan assets at end of year | 3,011 | 2,470
Canada | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,291 | 1,064
Unrealized and realized gains/(losses) | (41) | 155
Purchases and settlements, net | 40 | 72
Fair value of plan assets at end of year | 1,290 | 1,291
Canada | Pension | Alternatives |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,291 |
Fair value of plan assets at end of year | 1,290 | 1,291
Canada | Pension | Alternatives | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Alternatives | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Alternatives | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,291 |
Fair value of plan assets at end of year | 1,290 | 1,291
Canada | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 272 |
Fair value of plan assets at end of year | 227 | 272
Canada | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 272 |
Fair value of plan assets at end of year | 227 | 272
Canada | Pension | Cash and Cash Equivalents | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Cash and Cash Equivalents | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,263 |
Fair value of plan assets at end of year | 1,871 | 1,263
Canada | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,263 |
Fair value of plan assets at end of year | 1,871 | 1,263
Canada | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 355 |
Fair value of plan assets at end of year | 3 | 355
Canada | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 355 |
Fair value of plan assets at end of year | 3 | 355
Canada | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Government |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 636 |
Fair value of plan assets at end of year | 446 | 636
Canada | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 201 |
Fair value of plan assets at end of year | 0 | 201
Canada | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 435 |
Fair value of plan assets at end of year | 446 | 435
Canada | Pension | Government | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Corporate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 433 |
Fair value of plan assets at end of year | 667 | 433
Canada | Pension | Corporate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Corporate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 433 |
Fair value of plan assets at end of year | 667 | 433
Canada | Pension | Corporate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Foreign exchange contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | (16) |
Fair value of plan assets at end of year | 24 | (16)
Canada | Pension | Foreign exchange contracts | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Foreign exchange contracts | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | (16) |
Fair value of plan assets at end of year | 24 | (16)
Canada | Pension | Foreign exchange contracts | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 | 0
Fair value of plan assets at end of year | $ 0 | $ 0
US | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 45.00% |
Plan asset allocations | 39.50% | 38.30%
US | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 20.00% |
Plan asset allocations | 19.40% | 20.50%
US | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 35.00% |
Plan asset allocations | 41.10% | 41.20%
US | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 1,080 | $ 1,160
Fair value of plan assets at end of year | 1,052 | 1,080
US | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 13 |
Fair value of plan assets at end of year | 8 | 13
US | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 622 |
Fair value of plan assets at end of year | 611 | 622
US | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 445 | 337
Unrealized and realized gains/(losses) | (12) | 78
Purchases and settlements, net | 0 | 30
Fair value of plan assets at end of year | 433 | 445
US | Pension | Alternatives |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 445 |
Fair value of plan assets at end of year | 433 | 445
US | Pension | Alternatives | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Alternatives | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Alternatives | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 445 |
Fair value of plan assets at end of year | 433 | 445
US | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 13 |
Fair value of plan assets at end of year | 8 | 13
US | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 13 |
Fair value of plan assets at end of year | 8 | 13
US | Pension | Cash and Cash Equivalents | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Cash and Cash Equivalents | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 414 |
Fair value of plan assets at end of year | 416 | 414
US | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 414 |
Fair value of plan assets at end of year | 416 | 414
US | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Government |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 87 |
Fair value of plan assets at end of year | 46 | 87
US | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 87 |
Fair value of plan assets at end of year | 46 | 87
US | Pension | Government | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Corporate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 121 |
Fair value of plan assets at end of year | 149 | 121
US | Pension | Corporate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Corporate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 121 |
Fair value of plan assets at end of year | 149 | 121
US | Pension | Corporate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Foreign exchange contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Foreign exchange contracts | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Foreign exchange contracts | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | Pension | Foreign exchange contracts | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 185 | 201
Fair value of plan assets at end of year | 187 | 185
US | OPEB | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 185 |
Fair value of plan assets at end of year | 187 | 185
US | OPEB | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 48 |
Fair value of plan assets at end of year | 45 | 48
US | OPEB | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 109 |
Fair value of plan assets at end of year | 113 | 109
US | OPEB | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 28 | 22
Unrealized and realized gains/(losses) | 1 | 4
Purchases and settlements, net | 0 | 2
Fair value of plan assets at end of year | 29 | 28
US | OPEB | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 28 |
Fair value of plan assets at end of year | 29 | 28
US | OPEB | Alternatives | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 28 |
Fair value of plan assets at end of year | 29 | 28
US | OPEB | Alternatives | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Alternatives | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Alternatives | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 28 |
Fair value of plan assets at end of year | 29 | 28
US | OPEB | Cash and Cash Equivalents | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2 |
Fair value of plan assets at end of year | 3 | 2
US | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2 |
Fair value of plan assets at end of year | 3 | 2
US | OPEB | Cash and Cash Equivalents | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Cash and Cash Equivalents | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 34 |
Fair value of plan assets at end of year | 36 | 34
US | OPEB | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 34 |
Fair value of plan assets at end of year | 36 | 34
US | OPEB | Equity Securities, US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 62 |
Fair value of plan assets at end of year | 62 | 62
US | OPEB | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 62 |
Fair value of plan assets at end of year | 62 | 62
US | OPEB | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Government | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 51 |
Fair value of plan assets at end of year | 45 | 51
US | OPEB | Government | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 46 |
Fair value of plan assets at end of year | 42 | 46
US | OPEB | Government | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 3 | 5
US | OPEB | Government | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Corporate | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 8 |
Fair value of plan assets at end of year | 12 | 8
US | OPEB | Corporate | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
US | OPEB | Corporate | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 8 |
Fair value of plan assets at end of year | 12 | 8
US | OPEB | Corporate | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | $ 0 | $ 0

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