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PENSION AND OTHER POSTRETIREMENT BENEFITS - PLAN ASSETS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Canada | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 43.80% |
Plan asset allocations | 46.70% | 47.20%
Canada | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 28.90% |
Plan asset allocations | 29.80% | 29.60%
Canada | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 27.30% |
Plan asset allocations | 23.50% | 23.20%
Canada | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 4,077 | $ 3,827
Fair value of plan assets at end of year | 4,536 | 4,077
Canada | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 600 |
Fair value of plan assets at end of year | 637 | 600
Canada | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,565 |
Fair value of plan assets at end of year | 2,835 | 2,565
Canada | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 912 | 852
Unrealized and realized gains/(losses) | 77 | (27)
Purchases and settlements, net | 75 | 87
Fair value of plan assets at end of year | 1,064 | 912
Canada | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 213 |
Fair value of plan assets at end of year | 180 | 213
Canada | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 213 |
Fair value of plan assets at end of year | 180 | 213
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, Non-US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 366 |
Fair value of plan assets at end of year | 426 | 366
Canada | Pension | Equity Securities, Non-US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 178 |
Fair value of plan assets at end of year | 198 | 178
Canada | Pension | Equity Securities, Non-US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 188 |
Fair value of plan assets at end of year | 228 | 188
Canada | Pension | Equity Securities, Non-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
Canada | Pension | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2 |
Fair value of plan assets at end of year | 1 | 2
Canada | Pension | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2 |
Fair value of plan assets at end of year | 1 | 2
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 | 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 | 0
Canada | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 1,556 |
Fair value of plan assets at end of year | 1,693 | 1,556
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 | 1,556 |
Fair value of plan assets at end of year | 1,693 | 1,556
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 | 585 |
Fair value of plan assets at end of year | 717 | 585
Canada | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 207 |
Fair value of plan assets at end of year | 258 | 207
Canada | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 378 |
Fair value of plan assets at end of year | 459 | 378
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 | 410 |
Fair value of plan assets at end of year | 453 | 410
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 | 410 |
Fair value of plan assets at end of year | 453 | 410
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 | Infrastructure and real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 912 |
Fair value of plan assets at end of year | 1,064 | 912
Canada | Pension | Infrastructure and real estate | 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 | Infrastructure and real estate | 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 | Infrastructure and real estate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 912 |
Fair value of plan assets at end of year | 1,064 | 912
Canada | Pension | Foreign exchange contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 33 |
Fair value of plan assets at end of year | 2 | 33
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 | 33 |
Fair value of plan assets at end of year | 2 | 33
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 | 52.50% | 55.60%
United States | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 20.10% |
Plan asset allocations | 18.40% | 17.20%
United States | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 34.90% |
Plan asset allocations | 29.10% | 27.20%
United States | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 1,062 | $ 1,104
Fair value of plan assets at end of year | 1,160 | 1,062
United States | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 10 | 5
United States | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 768 |
Fair value of plan assets at end of year | 813 | 768
United States | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 289 | 276
Unrealized and realized gains/(losses) | 38 | 7
Purchases and settlements, net | 10 | 6
Fair value of plan assets at end of year | 337 | 289
United States | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 10 | 5
United States | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 10 | 5
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, Non-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 | 0
United States | Pension | Equity Securities, Non-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 | Pension | Equity Securities, Non-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 | 0
United States | Pension | Equity Securities, Non-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 | 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 | 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 | 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 | 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 | 0
United States | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 590 |
Fair value of plan assets at end of year | 609 | 590
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 | 590 |
Fair value of plan assets at end of year | 609 | 590
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 | 75 |
Fair value of plan assets at end of year | 86 | 75
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 | 75 |
Fair value of plan assets at end of year | 86 | 75
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 | 103 |
Fair value of plan assets at end of year | 118 | 103
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 | 103 |
Fair value of plan assets at end of year | 118 | 103
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 | Infrastructure and real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 289 |
Fair value of plan assets at end of year | 337 | 289
United States | Pension | Infrastructure and real estate | 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 | Infrastructure and real estate | 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 | Infrastructure and real estate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 289 |
Fair value of plan assets at end of year | 337 | 289
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 | 188 | 188
Fair value of plan assets at end of year | 201 | 188
United States | OPEB | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 188 |
Fair value of plan assets at end of year | 201 | 188
United States | OPEB | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 38 |
Fair value of plan assets at end of year | 51 | 38
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 | 128 | 128
United States | OPEB | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 22 | 18
Unrealized and realized gains/(losses) | 2 | 1
Purchases and settlements, net | (2) | 3
Fair value of plan assets at end of year | 22 | 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 | 22 | 22
United States | OPEB | Cash and Cash Equivalents | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at end of year | 4 |
United States | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at end of year | 4 |
United States | OPEB | Cash and Cash Equivalents | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at end of year | 0 |
United States | OPEB | Cash and Cash Equivalents | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at end of year | 0 |
United States | OPEB | Equity Securities, Non-US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 79 |
Fair value of plan assets at end of year | 75 | 79
United States | OPEB | Equity Securities, Non-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, Non-US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 79 |
Fair value of plan assets at end of year | 75 | 79
United States | OPEB | Equity Securities, Non-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, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 35 |
Fair value of plan assets at end of year | 39 | 35
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 | 35 |
Fair value of plan assets at end of year | 39 | 35
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 | Government | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 44 |
Fair value of plan assets at end of year | 53 | 44
United States | OPEB | Government | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 38 |
Fair value of plan assets at end of year | 47 | 38
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 | 6 | 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 end of year | 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
United States | OPEB | Infrastructure and real estate | 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 | 22 | 22
United States | OPEB | Infrastructure and real estate | 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 | Infrastructure and real estate | 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 | Infrastructure and real estate | 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 | $ 22 | $ 22

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