RELATED PARTY TRANSACTIONS - Transactions With Significantly Influenced Investees (Details) - CAD ($) $ in Millions	12 Months Ended
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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Gas Distribution Costs

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