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REVENUES (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | Major Products and Services
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Three months ended June 30, 2021
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 2,157 |  | 1,046 |  | 150 |  | — |  | — |  | — |  | 3,353 |
Storage and other revenue | 37 |  | 63 |  | 51 |  | — |  | — |  | — |  | 151 |
Gas gathering and processing revenue | — |  | 10 |  | — |  | — |  | — |  | — |  | 10 |
Gas distribution revenue | — |  | — |  | 725 |  | — |  | — |  | — |  | 725 |
Electricity and transmission revenue | — |  | — |  | — |  | 55 |  | — |  | — |  | 55 |
Total revenue from contracts with customers | 2,194 |  | 1,119 |  | 926 |  | 55 |  | — |  | — |  | 4,294 |
Commodity sales | — |  | — |  | — |  | — |  | 6,334 |  | — |  | 6,334 |
Other revenue 1,2 | 215 |  | 9 |  | 12 |  | 77 |  | 1 |  | 6 |  | 320 |
Intersegment revenue | 138 |  | — |  | 15 |  | — |  | 10 |  | (163) |  | — |
Total revenue | 2,547 |  | 1,128 |  | 953 |  | 132 |  | 6,345 |  | (157) |  | 10,948 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Three months ended June 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 2,141 |  | 1,126 |  | 151 |  | — |  | — |  | — |  | 3,418 |
Storage and other revenue | 24 |  | 66 |  | 56 |  | — |  | — |  | — |  | 146 |
Gas gathering and processing revenue | — |  | 5 |  | — |  | — |  | — |  | — |  | 5 |
Gas distribution revenue | — |  | — |  | 686 |  | — |  | — |  | — |  | 686 |
Electricity and transmission revenue | — |  | — |  | — |  | 54 |  | — |  | — |  | 54 |
Total revenue from contracts with customers | 2,165 |  | 1,197 |  | 893 |  | 54 |  | — |  | — |  | 4,309 |
Commodity sales | — |  | — |  | — |  | — |  | 2,936 |  | — |  | 2,936 |
Other revenue 1,2 | 598 |  | 5 |  | 8 |  | 96 |  | 11 |  | (7) |  | 711 |
Intersegment revenue | 182 |  | 1 |  | 2 |  | — |  | 2 |  | (187) |  | — |
Total revenue | 2,945 |  | 1,203 |  | 903 |  | 150 |  | 2,949 |  | (194) |  | 7,956 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Six months ended June 30, 2021
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 4,486 |  | 2,167 |  | 366 |  | — |  | — |  | — |  | 7,019 |
Storage and other revenue | 63 |  | 137 |  | 109 |  | — |  | — |  | — |  | 309 |
Gas gathering and processing revenue | — |  | 17 |  | — |  | — |  | — |  | — |  | 17 |
Gas distribution revenue | — |  | — |  | 2,259 |  | — |  | — |  | — |  | 2,259 |
Electricity and transmission revenue | — |  | — |  | — |  | 81 |  | — |  | — |  | 81 |
Total revenue from contracts with customers | 4,549 |  | 2,321 |  | 2,734 |  | 81 |  | — |  | — |  | 9,685 |
Commodity sales | — |  | — |  | — |  | — |  | 12,763 |  | — |  | 12,763 |
Other revenue 1,2 | 427 |  | 21 |  | 18 |  | 168 |  | 1 |  | 2 |  | 637 |
Intersegment revenue | 270 |  | — |  | 24 |  | — |  | 14 |  | (308) |  | — |
Total revenue | 5,246 |  | 2,342 |  | 2,776 |  | 249 |  | 12,778 |  | (306) |  | 23,085 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Six months ended June 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 4,581 |  | 2,381 |  | 366 |  | — |  | — |  | — |  | 7,328 |
Storage and other revenue | 50 |  | 145 |  | 103 |  | — |  | — |  | — |  | 298 |
Gas gathering and processing revenue | — |  | 12 |  | — |  | — |  | — |  | — |  | 12 |
Gas distribution revenue | — |  | — |  | 2,103 |  | — |  | — |  | — |  | 2,103 |
Electricity and transmission revenue | — |  | — |  | — |  | 104 |  | — |  | — |  | 104 |
Total revenue from contracts with customers | 4,631 |  | 2,538 |  | 2,572 |  | 104 |  | — |  | — |  | 9,845 |
Commodity sales | — |  | — |  | — |  | — |  | 10,325 |  | — |  | 10,325 |
Other revenue 1,2 | (419) |  | 21 |  | 7 |  | 199 |  | 4 |  | (13) |  | (201) |
Intersegment revenue | 267 |  | 1 |  | 6 |  | — |  | 18 |  | (292) |  | — |
Total revenue | 4,479 |  | 2,560 |  | 2,585 |  | 303 |  | 10,347 |  | (305) |  | 19,969 |
1 Includes mark-to-market gains from our hedging program for the three months ended June 30, 2021 and 2020 of $131 million and $531 million, respectively. For the six months ended June 30, 2021 and 2020, other revenue includes a $261 million mark-to-market gain and $575 million mark-to-market loss, respectively. 2 Includes revenues from lease contracts for the three months ended June 30, 2021 and 2020 of $143 million and $157 million, respectively and for the six months ended June 30, 2021 and 2020 of $302 million and $315 million, respectively. Recognition and Measurement of Revenues
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Three months ended June 30, 2021
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 17 |  | — |  |  | 17 |
Revenues from products and services transferred over time 1 | 2,194 |  | 1,119 |  | 909 |  | 55 |  |  | 4,277 |
Total revenue from contracts with customers | 2,194 |  | 1,119 |  | 926 |  | 55 |  |  | 4,294 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Three months ended June 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 15 |  | — |  |  | 15 |
Revenues from products and services transferred over time 1 | 2,165 |  | 1,197 |  | 878 |  | 54 |  |  | 4,294 |
Total revenue from contracts with customers | 2,165 |  | 1,197 |  | 893 |  | 54 |  |  | 4,309 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Six months ended June 30, 2021
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 34 |  | — |  |  | 34 |
Revenues from products and services transferred over time 1 | 4,549 |  | 2,321 |  | 2,700 |  | 81 |  |  | 9,651 |
Total revenue from contracts with customers | 4,549 |  | 2,321 |  | 2,734 |  | 81 |  |  | 9,685 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Six months ended June 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 30 |  | — |  |  | 30 |
Revenues from products and services transferred over time 1 | 4,631 |  | 2,538 |  | 2,542 |  | 104 |  |  | 9,815 |
Total revenue from contracts with customers | 4,631 |  | 2,538 |  | 2,572 |  | 104 |  |  | 9,845 |
1 Includes revenues from crude oil and natural gas pipeline transportation, storage, natural gas gathering, compression and treating, natural gas distribution, natural gas storage services and electricity sales.
Contract with customer, asset and liability | Contract Balances
| Contract Receivables | Contract Assets | Contract Liabilities
(millions of Canadian dollars) |  |  |
Balance as at June 30, 2021 | 1,755 |  | 213 |  | 1,708 |
Balance as at December 31, 2020 | 2,042 |  | 226 |  | 1,815 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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