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PENSION AND OTHER POSTRETIREMENT BENEFITS - Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Canada | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 43.80% |
Plan asset allocations | 38.20% | 46.70%
Canada | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 28.40% |
Plan asset allocations | 31.70% | 29.80%
Canada | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 27.80% |
Plan asset allocations | 30.10% | 23.50%
Canada | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 4,536 | $ 4,077
Fair value of plan assets at end of year | 4,234 | 4,536
Canada | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 637 |
Fair value of plan assets at end of year | 473 | 637
Canada | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,835 |
Fair value of plan assets at end of year | 2,470 | 2,835
Canada | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,064 | 912
Unrealized and realized gains | 155 | 77
Purchases and settlements, net | 72 | 75
Fair value of plan assets at end of year | 1,291 | 1,064
Canada | Pension | Alternatives |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,064 |
Fair value of plan assets at end of year | 1,291 | 1,064
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 | 1,064 |
Fair value of plan assets at end of year | 1,291 | 1,064
Canada | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 180 |
Fair value of plan assets at end of year | 272 | 180
Canada | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 180 |
Fair value of plan assets at end of year | 272 | 180
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 | 1,693 |
Fair value of plan assets at end of year | 1,263 | 1,693
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 | 1,693 |
Fair value of plan assets at end of year | 1,263 | 1,693
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, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1 |
Fair value of plan assets at end of year |  | 1
Canada | Pension | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1 |
Fair value of plan assets at end of year |  | 1
Canada | Pension | Equity Securities, US | 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
Canada | Pension | 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
Canada | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 426 |
Fair value of plan assets at end of year | 355 | 426
Canada | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 198 |
Fair value of plan assets at end of year | 0 | 198
Canada | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 228 |
Fair value of plan assets at end of year | 355 | 228
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 | 717 |
Fair value of plan assets at end of year | 636 | 717
Canada | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 258 |
Fair value of plan assets at end of year | 201 | 258
Canada | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 459 |
Fair value of plan assets at end of year | 435 | 459
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 | 453 |
Fair value of plan assets at end of year | 433 | 453
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 | 453 |
Fair value of plan assets at end of year | 433 | 453
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 | 2 |
Fair value of plan assets at end of year | (16) | 2
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 | 2 |
Fair value of plan assets at end of year | (16) | 2
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
United States | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 45.00% |
Plan asset allocations | 38.30% | 52.50%
United States | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 20.00% |
Plan asset allocations | 20.50% | 18.40%
United States | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 35.00% |
Plan asset allocations | 41.20% | 29.10%
United States | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 1,160 | $ 1,062
Fair value of plan assets at end of year | 1,080 | 1,160
United States | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 10 |
Fair value of plan assets at end of year | 13 | 10
United States | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 813 |
Fair value of plan assets at end of year | 622 | 813
United States | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 337 | 289
Unrealized and realized gains | 78 | 38
Purchases and settlements, net | 30 | 10
Fair value of plan assets at end of year | 445 | 337
United States | Pension | Alternatives |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 337 |
Fair value of plan assets at end of year | 445 | 337
United States | 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
United States | 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
United States | Pension | Alternatives | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 337 |
Fair value of plan assets at end of year | 445 | 337
United States | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 10 |
Fair value of plan assets at end of year | 13 | 10
United States | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 10 |
Fair value of plan assets at end of year | 13 | 10
United States | 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
United States | 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
United States | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 609 |
Fair value of plan assets at end of year | 414 | 609
United States | 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
United States | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 609 |
Fair value of plan assets at end of year | 414 | 609
United States | 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
United States | Pension | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
United States | Pension | 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
United States | Pension | Equity Securities, US | 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
United States | Pension | 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
United States | 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
United States | 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
United States | 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
United States | 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
United States | Pension | Government |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 86 |
Fair value of plan assets at end of year | 87 | 86
United States | 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
United States | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 86 |
Fair value of plan assets at end of year | 87 | 86
United States | 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
United States | Pension | Corporate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 118 |
Fair value of plan assets at end of year | 121 | 118
United States | 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
United States | Pension | Corporate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 118 |
Fair value of plan assets at end of year | 121 | 118
United States | 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
United States | 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
United States | 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
United States | 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
United States | 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
United States | OPEB |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 201 | 188
Fair value of plan assets at end of year | 185 | 201
United States | OPEB | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 201 |
Fair value of plan assets at end of year | 185 | 201
United States | OPEB | Level 1 | 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 | 48 | 51
United States | OPEB | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 128 |
Fair value of plan assets at end of year | 109 | 128
United States | OPEB | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 22 | 22
Unrealized and realized gains | 4 | 2
Purchases and settlements, net | 2 | (2)
Fair value of plan assets at end of year | 28 | 22
United States | OPEB | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 22 |
Fair value of plan assets at end of year | 28 | 22
United States | OPEB | Alternatives | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 22 |
Fair value of plan assets at end of year | 28 | 22
United States | 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
United States | 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
United States | OPEB | Alternatives | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 22 |
Fair value of plan assets at end of year | 28 | 22
United States | OPEB | Cash and Cash Equivalents | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 4 |
Fair value of plan assets at end of year | 2 | 4
United States | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 4 |
Fair value of plan assets at end of year | 2 | 4
United States | 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
United States | 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
United States | OPEB | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 39 |
Fair value of plan assets at end of year | 34 | 39
United States | 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
United States | OPEB | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 39 |
Fair value of plan assets at end of year | 34 | 39
United States | 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
United States | OPEB | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 75 |
Fair value of plan assets at end of year | 62 | 75
United States | 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
United States | OPEB | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 75 |
Fair value of plan assets at end of year | 62 | 75
United States | 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
United States | OPEB | Government | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 53 |
Fair value of plan assets at end of year | 51 | 53
United States | OPEB | Government | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 47 |
Fair value of plan assets at end of year | 46 | 47
United States | OPEB | Government | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 6 |
Fair value of plan assets at end of year | 5 | 6
United States | 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
United States | 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 | 8 | 8
United States | 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
United States | 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 | 8 | 8
United States | 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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