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PENSION AND OTHER POSTRETIREMENT BENEFITS - RETIREMENT SAVINGS PLAN (Details) - United States - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension and Other Postretirement Benefit Disclosures |  |  |
Percent of match (percent) | 6.00% |  |
Total contributions by the Company | $ 27 | $ 27 | $ 27

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