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REVENUE (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 $ 18,817 $ 19,697 $ 20,797
Total operating revenues $ 10,008 $ 9,110 $ 7,956 $ 12,013 $ 12,352 $ 11,598 $ 13,263 $ 12,856 39,087 50,069 46,378
Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 60 69 1,658
Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 18,757 19,628 19,139
Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 14,358 14,302 13,291
Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 571 578 519
Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 27 423 815
Gas distribution sales / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 3,663 4,210 4,376
Total operating revenues                 3,663 4,205 4,360
Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 198 180 206
Commodity sales / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   4 1,590
Revenue not from contract with customers                 19,259 29,305 26,070
Total operating revenues                 19,259 29,309 27,660
Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 1,011 1,067 (489)
Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,255 9,191 8,589
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                 9,255 9,191 8,589
Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,824 5,172 6,555
Gas Transmission and Midstream | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 4 1,590
Gas Transmission and Midstream | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,824 5,168 4,965
Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,540 5,154 5,447
Gas Distribution and Storage | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 60 65 68
Gas Distribution and Storage | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,480 5,089 5,379
Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 198 180 206
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                 198 180 206
Business segments | Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,255 9,191 8,589
Total operating revenues                 10,423 10,219 8,079
Business segments | Liquids Pipelines | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,161 9,082 8,488
Business segments | Liquids Pipelines | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 94 109 101
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 sales / costs                      
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 / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   0 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                 584 659 (894)
Business segments | Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,824 5,172 6,555
Total operating revenues                 4,870 5,207 6,571
Business segments | Gas Transmission and Midstream | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,523 4,477 3,928
Business segments | Gas Transmission and Midstream | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 274 268 222
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 27 423 815
Business segments | Gas Transmission and Midstream | Gas distribution sales / costs                      
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 / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   4 1,590
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                 44 30 6
Business segments | Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,540 5,154 5,447
Total operating revenues                 4,569 5,179 5,470
Business segments | Gas Distribution and Storage | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 674 743 875
Business segments | Gas Distribution and Storage | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 203 201 196
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 sales / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 3,663 4,210 4,376
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 / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   0 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                 17 9 9
Business segments | Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 198 180 206
Total operating revenues                 587 567 567
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 sales / costs                      
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                 198 180 206
Business segments | Renewable Power Generation | Commodity sales / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   0 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                 389 387 361
Business segments | Energy Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0 0
Total operating revenues                 19,283 29,374 26,228
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 sales / costs                      
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 / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   0 0
Revenue not from contract with customers                 19,259 29,305 26,070
Business segments | Energy Services | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 0 (2) 4
Eliminations and Other                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0 0
Total operating revenues                 (645) (477) (537)
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 sales / costs                      
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 / costs                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                   0 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                 (23) (16) 25
Intersegment revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 (622) (461) (562)
Intersegment revenue | Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 584 369 384
Intersegment revenue | Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 2 5 10
Intersegment revenue | Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 12 16 14
Intersegment revenue | Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 0 0 0
Intersegment revenue | Energy Services                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 $ 24 $ 71 $ 154