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REVENUE (Details) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 CAD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 CAD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | $ 5,207 |  |  | $ 11,600 |  |
Revenues | 10,745 |  | $ 11,116 | 23,471 |  | $ 22,262
Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 659 |  |  | 1,377 |  |
Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 4,548 |  |  | 10,223 |  |
Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 3,188 |  |  | 6,437 |  |
Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 145 |  |  | 311 |  |
Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 231 |  |  | 436 |  |
Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 856 |  |  | 2,782 |  |
Revenues | 856 |  | 847 | 2,782 |  | 2,210
Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 148 |  |  | 302 |  |
Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 639 |  |  | 1,332 |  |
Revenue not from contract with customers | 5,812 |  |  | 12,387 |  |
Revenues | 6,451 |  | 6,620 | 13,719 |  | 13,486
Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | (274) |  |  | (516) |  |
Liquids Pipelines |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 2,121 |  |  | 4,219 |  |
Liquids Pipelines | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Liquids Pipelines | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 2,121 |  |  | 4,219 |  |
Gas Transmission and Midstream |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,879 |  |  | 3,789 |  |
Gas Transmission and Midstream | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 639 |  |  | 1,332 |  |
Gas Transmission and Midstream | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,240 |  |  | 2,457 |  |
Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,059 |  |  | 3,290 |  |
Gas Distribution | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 20 |  |  | 45 |  |
Gas Distribution | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,039 |  |  | 3,245 |  |
Green Power and Transmission |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 148 |  |  | 302 |  |
Green Power and Transmission | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Green Power and Transmission | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 148 |  |  | 302 |  |
Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Energy Services | Transferred at Point in Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Energy Services | Transferred over Time |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Liquids Pipelines |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 2,121 |  |  | 4,219 |  |
Revenues | 1,950 |  | 2,243 | 3,859 |  | 4,398
Business segments | Liquids Pipelines | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 2,079 |  |  | 4,137 |  |
Business segments | Liquids Pipelines | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 42 |  |  | 82 |  |
Business segments | Liquids Pipelines | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Liquids Pipelines | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Liquids Pipelines | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Liquids Pipelines | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 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 | (261) |  |  | (530) |  |
Business segments | Gas Transmission and Midstream |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,879 |  |  | 3,789 |  |
Revenues | 1,864 |  | 1,954 | 3,801 |  | 3,189
Business segments | Gas Transmission and Midstream | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 958 |  |  | 1,910 |  |
Business segments | Gas Transmission and Midstream | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 51 |  |  | 111 |  |
Business segments | Gas Transmission and Midstream | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 231 |  |  | 436 |  |
Business segments | Gas Transmission and Midstream | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Gas Transmission and Midstream | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Gas Transmission and Midstream | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 639 |  |  | 1,332 |  |
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 | (17) |  |  | 8 |  |
Business segments | Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 1,059 |  |  | 3,290 |  |
Revenues | 1,070 |  |  | 3,307 |  |
Business segments | Gas Distribution | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 151 |  |  | 390 |  |
Business segments | Gas Distribution | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 52 |  |  | 118 |  |
Business segments | Gas Distribution | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Gas Distribution | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 856 |  |  | 2,782 |  |
Business segments | Gas Distribution | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Gas Distribution | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenue not from contract with customers | 0 |  |  | 0 |  |
Business segments | Gas Distribution | Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 9 |  |  | 11 |  |
Business segments | Green Power and Transmission |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 148 |  |  | 302 |  |
Revenues | 149 |  | 140 | 306 |  | 277
Business segments | Green Power and Transmission | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Green Power and Transmission | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Green Power and Transmission | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Green Power and Transmission | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Green Power and Transmission | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 148 |  |  | 302 |  |
Business segments | Green Power and Transmission | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenue not from contract with customers | 0 |  |  | 0 |  |
Business segments | Green Power and Transmission | Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 1 |  |  | 4 |  |
Business segments | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenues | 5,836 |  |  | 12,468 |  |
Business segments | Energy Services | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Energy Services | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Energy Services | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Energy Services | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Energy Services | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Business segments | Energy Services | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenue not from contract with customers | 5,812 |  |  | 12,387 |  |
Business segments | Energy Services | Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 0 |  |  | 0 |  |
Intersegment Eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | (118) | $ 0 |  | (261) | $ 0 |
Intersegment Eliminations | Liquids Pipelines |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 90 |  |  | 170 |  |
Intersegment Eliminations | Gas Transmission and Midstream |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 2 |  |  | 4 |  |
Intersegment Eliminations | Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 2 |  |  | 6 |  |
Intersegment Eliminations | Green Power and Transmission |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 0 |  |  | 0 |  |
Intersegment Eliminations | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | 24 |  |  | 81 |  |
Consolidation, Eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenues | (124) |  | $ (98) | (270) |  | $ (196)
Consolidation, Eliminations | Transportation revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Consolidation, Eliminations | Storage and Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Consolidation, Eliminations | Gas Gathering and Processing Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Consolidation, Eliminations | Gas Distribution Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Consolidation, Eliminations | Electricity and Transmission Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Consolidation, Eliminations | Commodity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contract with customer | 0 |  |  | 0 |  |
Revenue not from contract with customers | 0 |  |  | 0 |  |
Consolidation, Eliminations | Other Revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue not from contract with customers | $ (6) |  |  | $ (9) |  |

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