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REVENUE (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | $ 19,432 | $ 18,817 | $ 19,697
Total operating revenues | $ 12,470 | $ 11,466 | $ 10,948 | $ 12,187 | $ 10,008 | $ 9,110 | $ 7,956 | $ 12,013 | 47,071 | 39,087 | 50,069
Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 70 | 60 | 69
Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 19,362 | 18,757 | 19,628
Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 14,532 | 14,358 | 14,302
Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 648 | 571 | 578
Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 49 | 27 | 423
Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,026 | 3,663 | 4,210
Total operating revenues |  |  |  |  |  |  |  |  | 4,026 | 3,663 | 4,205
Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 177 | 198 | 180
Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 4
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 26,873 | 19,259 | 29,305
Total operating revenues |  |  |  |  |  |  |  |  | 26,873 | 19,259 | 29,309
Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 766 | 1,011 | 1,067
Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 9,639 | 9,255 | 9,191
Liquids Pipelines | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Liquids Pipelines | Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 9,639 | 9,255 | 9,191
Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,668 | 4,824 | 5,172
Gas Transmission and Midstream | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 4
Gas Transmission and Midstream | Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,668 | 4,824 | 5,168
Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,948 | 4,540 | 5,154
Gas Distribution and Storage | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 70 | 60 | 65
Gas Distribution and Storage | Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,878 | 4,480 | 5,089
Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 177 | 198 | 180
Renewable Power Generation | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Renewable Power Generation | Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 177 | 198 | 180
Business segments | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 9,639 | 9,255 | 9,191
Total operating revenues |  |  |  |  |  |  |  |  | 10,581 | 10,423 | 10,219
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 9,492 | 9,161 | 9,082
Business segments | Liquids Pipelines | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 147 | 94 | 109
Business segments | Liquids Pipelines | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Liquids Pipelines | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Liquids Pipelines | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Liquids Pipelines | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Liquids Pipelines | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 375 | 584 | 659
Business segments | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,668 | 4,824 | 5,172
Total operating revenues |  |  |  |  |  |  |  |  | 4,711 | 4,870 | 5,207
Business segments | Gas Transmission and Midstream | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,364 | 4,523 | 4,477
Business segments | Gas Transmission and Midstream | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 255 | 274 | 268
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 49 | 27 | 423
Business segments | Gas Transmission and Midstream | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 4
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 42 | 44 | 30
Business segments | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,948 | 4,540 | 5,154
Total operating revenues |  |  |  |  |  |  |  |  | 4,980 | 4,569 | 5,179
Business segments | Gas Distribution and Storage | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 676 | 674 | 743
Business segments | Gas Distribution and Storage | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 246 | 203 | 201
Business segments | Gas Distribution and Storage | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 4,026 | 3,663 | 4,210
Business segments | Gas Distribution and Storage | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Gas Distribution and Storage | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 13 | 17 | 9
Business segments | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 177 | 198 | 180
Total operating revenues |  |  |  |  |  |  |  |  | 512 | 587 | 567
Business segments | Renewable Power Generation | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Renewable Power Generation | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Renewable Power Generation | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Renewable Power Generation | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Renewable Power Generation | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 177 | 198 | 180
Business segments | Renewable Power Generation | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Renewable Power Generation | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 336 | 389 | 387
Business segments | Energy Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating revenues |  |  |  |  |  |  |  |  | 26,917 | 19,283 | 29,374
Business segments | Energy Services | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Energy Services | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Energy Services | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Energy Services | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Energy Services | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Business segments | Energy Services | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 26,873 | 19,259 | 29,305
Business segments | Energy Services | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | (2)
Eliminations and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating revenues |  |  |  |  |  |  |  |  | (630) | (645) | (477)
Eliminations and Other | Transportation revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Storage and other revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Gas gathering and processing revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Electricity and transmission revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Commodity sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  | 0
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations and Other | Other Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 0 | (23) | (16)
Intersegment revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | (630) | (622) | (461)
Intersegment revenue | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 567 | 584 | 369
Intersegment revenue | Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 1 | 2 | 5
Intersegment revenue | Gas Distribution and Storage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | 19 | 12 | 16
Intersegment revenue | Renewable Power Generation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | (1) | 0 | 0
Intersegment revenue | Energy Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customers |  |  |  |  |  |  |  |  | $ 44 | $ 24 | $ 71

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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