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REVENUES - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 5,592 | $ 5,174 | $ 12,805 | $ 11,661
Total revenues | 10,432 | 13,215 | 22,507 | 28,312
Mark-to-market (loss) gain from hedging program | (3) | 198 | (52) | 104
Revenues from lease contracts | 136 | 143 | 280 | 307
Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 37 | 20 | 67 | 36
Revenue from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5,555 | 5,154 | 12,738 | 11,625
Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,461 | 3,922 | 9,063 | 8,052
Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 260 | 246 | 518 | 428
Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 6 |  | 21
Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 796 | 919 | 3,083 | 3,017
Total revenues | 792 | 905 | 3,071 | 3,003
Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 81 | 141 | 143
Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 4,679 | 8,108 | 9,462 | 16,433
Total revenues | 4,679 | 8,108 | 9,462 | 16,433
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 161 | (67) | 240 | 218
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,064 | 2,629 | 6,070 | 5,365
Liquids Pipelines | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Liquids Pipelines | Revenue from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,064 | 2,629 | 6,070 | 5,365
Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,403 | 1,289 | 2,882 | 2,582
Gas Transmission and Midstream | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Gas Transmission and Midstream | Revenue from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,403 | 1,289 | 2,882 | 2,582
Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,050 | 1,175 | 3,712 | 3,571
Gas Distribution and Storage | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 37 | 20 | 67 | 36
Gas Distribution and Storage | Revenue from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,013 | 1,155 | 3,645 | 3,535
Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 81 | 141 | 143
Renewable Power Generation | Revenues from products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Renewable Power Generation | Revenue from products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 81 | 141 | 143
Business segments | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,064 | 2,629 | 6,070 | 5,365
Total revenues | 3,270 | 2,638 | 6,435 | 5,693
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,002 | 2,565 | 5,944 | 5,250
Business segments | Liquids Pipelines | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 62 | 64 | 126 | 115
Business segments | Liquids Pipelines | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 |  | 0
Business segments | Liquids Pipelines | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 79 | (145) | 109 | 33
Business segments | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,403 | 1,289 | 2,882 | 2,582
Total revenues | 1,410 | 1,301 | 2,901 | 2,601
Business segments | Gas Transmission and Midstream | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,290 | 1,200 | 2,674 | 2,394
Business segments | Gas Transmission and Midstream | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 113 | 83 | 208 | 167
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 6 |  | 21
Business segments | Gas Transmission and Midstream | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 7 | 11 | 18 | 18
Business segments | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,050 | 1,175 | 3,712 | 3,571
Total revenues | 1,050 | 1,138 | 3,675 | 3,549
Business segments | Gas Distribution and Storage | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 169 | 157 | 445 | 408
Business segments | Gas Distribution and Storage | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 85 | 99 | 184 | 146
Business segments | Gas Distribution and Storage | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 |  | 0
Business segments | Gas Distribution and Storage | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 796 | 919 | 3,083 | 3,017
Business segments | Gas Distribution and Storage | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (1) | (37) | (41) | (33)
Business segments | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 81 | 141 | 143
Total revenues | 150 | 155 | 294 | 311
Business segments | Renewable Power Generation | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 |  | 0
Business segments | Renewable Power Generation | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 81 | 141 | 143
Business segments | Renewable Power Generation | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 76 | 74 | 154 | 168
Business segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Total revenues | 4,679 | 8,138 | 9,480 | 16,475
Business segments | Energy Services | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Energy Services | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Energy Services | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 |  | 0
Business segments | Energy Services | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Energy Services | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Business segments | Energy Services | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 4,679 | 8,108 | 9,462 | 16,433
Business segments | Energy Services | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 30 | 0 | 32
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Total revenues | (127) | (155) | (278) | (317)
Eliminations and Other | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Storage and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Gas gathering and processing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 |  | 0
Eliminations and Other | Gas distribution sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Electricity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Eliminations and Other | Commodity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Eliminations and Other | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Intersegment revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (127) | (155) | (278) | (317)
Total revenues | (127) | (155) | (278) | (317)
Intersegment revenue | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 127 | 154 | 256 | 295
Intersegment revenue | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 1 | 1 | 1
Intersegment revenue | Gas Distribution and Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 0 | 4 | 11
Intersegment revenue | Renewable Power Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (1) | 0 | (1) | 0
Intersegment revenue | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | $ 0 | $ 0 | $ 18 | $ 10

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