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PENSION AND OTHER POSTRETIREMENT BENEFITS - AMOUNT RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Canada | Pension |  |
Amount included in AOCI |  |
Net actuarial loss (gain) | $ 445 | $ 435
Prior service credit | 0 | 0
Total amount recognized in AOCI | 445 | 435
Canada | OPEB |  |
Amount included in AOCI |  |
Net actuarial loss (gain) | (7) | (29)
Prior service credit | (1) | (2)
Total amount recognized in AOCI | (8) | (31)
United States | Pension |  |
Amount included in AOCI |  |
Net actuarial loss (gain) | 134 | 133
Prior service credit | (2) | (3)
Total amount recognized in AOCI | 132 | 130
United States | OPEB |  |
Amount included in AOCI |  |
Net actuarial loss (gain) | (23) | (15)
Prior service credit | (13) | (15)
Total amount recognized in AOCI | $ (36) | $ (30)

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