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REVENUES (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 4,552 | $ 5,112 | $ 10,308 | $ 11,408
Revenues | 13,263 | 10,745 | 26,119 | 23,471
Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 20 | 659 | 37 | 1,377
Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4,532 | 4,453 | 10,271 | 10,031
Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3,514 | 3,188 | 7,114 | 6,437
Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 123 | 145 | 257 | 311
Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 115 | 231 | 231 | 436
Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 754 | 856 | 2,610 | 2,782
Revenues | 755 | 856 | 2,631 | 2,782
Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 53 | 93 | 110
Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3 | 639 | 3 | 1,332
Revenue not from contract with customers | 8,413 | 5,812 | 15,045 | 12,387
Revenues | 8,416 | 6,451 | 15,048 | 13,719
Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 298 | (179) | 766 | (324)
Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,255 | 2,121 | 4,496 | 4,219
Liquids Pipelines | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Liquids Pipelines | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,255 | 2,121 | 4,496 | 4,219
Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,277 | 1,879 | 2,583 | 3,789
Gas Transmission and Midstream | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3 | 639 | 3 | 1,332
Gas Transmission and Midstream | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,274 | 1,240 | 2,580 | 2,457
Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 977 | 1,059 | 3,136 | 3,290
Gas Distribution | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 17 | 20 | 34 | 45
Gas Distribution | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 960 | 1,039 | 3,102 | 3,245
Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 53 | 93 | 110
Renewable Power Generation and Transmission | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Renewable Power Generation and Transmission | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 53 | 93 | 110
Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Energy Services | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Energy Services | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,255 | 2,121 | 4,496 | 4,219
Revenues | 2,569 | 1,950 | 5,227 | 3,859
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2,230 | 2,079 | 4,444 | 4,137
Business segments | Liquids Pipelines | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 25 | 42 | 52 | 82
Business segments | Liquids Pipelines | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Liquids Pipelines | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
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 | 199 | (261) | 539 | (530)
Business segments | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,277 | 1,879 | 2,583 | 3,789
Revenues | 1,288 | 1,864 | 2,606 | 3,801
Business segments | Gas Transmission and Midstream | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1,113 | 958 | 2,250 | 1,910
Business segments | Gas Transmission and Midstream | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 46 | 51 | 99 | 111
Business segments | Gas Transmission and Midstream | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 115 | 231 | 231 | 436
Business segments | Gas Transmission and Midstream | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Transmission and Midstream | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3 | 639 | 3 | 1,332
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 | 10 | (17) | 20 | 8
Business segments | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 977 | 1,059 | 3,136 | 3,290
Revenues | 977 | 1,070 | 3,168 | 3,307
Business segments | Gas Distribution | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 171 | 151 | 420 | 390
Business segments | Gas Distribution | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 52 | 52 | 106 | 118
Business segments | Gas Distribution | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 754 | 856 | 2,610 | 2,782
Business segments | Gas Distribution | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Gas Distribution | Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (3) | 9 | 26 | 11
Business segments | Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 53 | 93 | 110
Revenues | 137 | 149 | 289 | 306
Business segments | Renewable Power Generation and Transmission | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation and Transmission | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation and Transmission | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation and Transmission | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation and Transmission | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 43 | 53 | 93 | 110
Business segments | Renewable Power Generation and Transmission | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Revenue not from contract with customers | 0 | 0 | 0 | 0
Business segments | Renewable Power Generation and Transmission | Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 94 | 96 | 196 | 196
Business segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Revenues | 8,418 | 5,836 | 15,091 | 12,468
Business segments | Energy Services | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Energy Services | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Energy Services | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Energy Services | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Energy Services | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Business segments | Energy Services | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Revenue not from contract with customers | 8,413 | 5,812 | 15,045 | 12,387
Business segments | Energy Services | Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (7) | 0 | (1) | 0
Eliminations and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Revenues | (126) | (124) | (262) | (270)
Eliminations and Other | Transportation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Eliminations and Other | Storage and Other Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Eliminations and Other | Gas Gathering and Processing Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Eliminations and Other | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Eliminations and Other | Electricity and Transmission Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
Eliminations and Other | Commodity |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0
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 | 5 | (6) | (14) | (9)
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | (131) | (118) | (248) | (261)
Revenues | (126) | (124) | (262) | (270)
Intersegment Eliminations | Liquids Pipelines |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 115 | 90 | 192 | 170
Intersegment Eliminations | Gas Transmission and Midstream |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 1 | 2 | 3 | 4
Intersegment Eliminations | Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 3 | 2 | 6 | 6
Intersegment Eliminations | Renewable Power Generation and Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | 0 | 0 | 0 | 0
Intersegment Eliminations | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue not from contract with customers | $ 12 | $ 24 | $ 47 | $ 81

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