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REVENUE (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 $ 19,697 $ 20,797  
Total operating revenues $ 12,352 $ 11,598 $ 13,263 $ 12,856 $ 11,562 $ 11,345 $ 10,745 $ 12,726 50,069 46,378 $ 44,378
Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 69 1,658  
Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 19,628 19,139  
Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 14,302 13,291  
Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 578 519  
Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 423 815  
Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,210 4,376  
Total operating revenues                 4,205 4,360 4,215
Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 180 206  
Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4 1,590  
Revenue not from contract with customers                 29,305 26,070  
Total operating revenues                 29,309 27,660 26,286
Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 1,067 (489)  
Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,191 8,589  
Liquids Pipelines | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Liquids Pipelines | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,191 8,589  
Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,172 6,555  
Gas Transmission and Midstream | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4 1,590  
Gas Transmission and Midstream | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,168 4,965  
Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,154 5,447  
Gas Distribution and Storage | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 65 68  
Gas Distribution and Storage | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,089 5,379  
Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 180 206  
Renewable Power Generation | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Renewable Power Generation | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 180 206  
Energy Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Energy Services | Transferred at Point in Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Energy Services | Transferred over Time                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,191 8,589  
Total operating revenues                 10,219 8,079 8,913
Business segments | Liquids Pipelines | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 9,082 8,488  
Business segments | Liquids Pipelines | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 109 101  
Business segments | Liquids Pipelines | Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Liquids Pipelines | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Liquids Pipelines | Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Liquids Pipelines | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Revenue not from contract with customers                 0 0  
Business segments | Liquids Pipelines | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 659 (894)  
Business segments | Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,172 6,555  
Total operating revenues                 5,207 6,571  
Business segments | Gas Transmission and Midstream | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 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                 268 222  
Business segments | Gas Transmission and Midstream | Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 423 815  
Business segments | Gas Transmission and Midstream | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 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  
Business segments | Gas Transmission and Midstream | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4 1,590  
Revenue not from contract with customers                 0 0  
Business segments | Gas Transmission and Midstream | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 30 6  
Business segments | Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 5,154 5,447  
Total operating revenues                 5,179 5,470 4,992
Business segments | Gas Distribution and Storage | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 743 875  
Business segments | Gas Distribution and Storage | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 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  
Business segments | Gas Distribution and Storage | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 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  
Business segments | Gas Distribution and Storage | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Revenue not from contract with customers                 0 0  
Business segments | Gas Distribution and Storage | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 9 9  
Business segments | Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 180 206  
Total operating revenues                 567 567 534
Business segments | Renewable Power Generation | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Renewable Power Generation | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 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  
Business segments | Renewable Power Generation | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Renewable Power Generation | Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 180 206  
Business segments | Renewable Power Generation | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Revenue not from contract with customers                 0 0  
Business segments | Renewable Power Generation | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 387 361  
Business segments | Energy Services                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Total operating revenues                 29,374 26,228  
Business segments | Energy Services | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Energy Services | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Energy Services | Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Energy Services | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Energy Services | Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Business segments | Energy Services | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Revenue not from contract with customers                 29,305 26,070  
Business segments | Energy Services | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 (2) 4  
Eliminations and Other                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Total operating revenues                 (477) (537)  
Eliminations and Other | Transportation revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Eliminations and Other | Storage and other revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Eliminations and Other | Gas gathering and processing revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Eliminations and Other | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Eliminations and Other | Electricity and transmission revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Eliminations and Other | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 0 0  
Revenue not from contract with customers                 0 0  
Eliminations and Other | Other Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 (16) 25  
Intersegment revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 (461) (562)  
Total operating revenues                 (477) (537) (410)
Intersegment revenue | Liquids Pipelines                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 369 384  
Intersegment revenue | Gas Transmission and Midstream                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 5 10  
Intersegment revenue | Gas Distribution and Storage                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 16 14  
Intersegment revenue | Renewable Power Generation                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 0 0  
Intersegment revenue | Energy Services                      
Disaggregation of Revenue [Line Items]                      
Revenue not from contract with customers                 71 154  
Eliminations and Other                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 0 0 0
Eliminations and Other | Gas distribution revenue                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 0 0 0
Eliminations and Other | Commodity sales                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 $ 0 $ 0 $ 0