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RELATED PARTY TRANSACTIONS - Transactions With Significantly Influenced Investees (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Significantly Influenced Investees |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Transportation and other services | $ 149 | $ 133 | $ 140
Commodity sales | 20 | 21 | 107
Operating and administrative | 292 | 252 | 241
Recoveries recorded on expenses | 104 | 94 | 86
Commodity costs | 790 | 518 | 773
Gas distribution costs | 131 | 135 | 133
Seaway Crude Pipeline System |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Operating and administrative | 389 | 342 | 327
Aux Sable Canada LP |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Commodity costs | $ 447 | $ 91 | $ 272

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