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REVENUES (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2021
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 2,329 |  | 1,121 |  | 216 |  | — |  | — |  | — |  | 3,666 |
Storage and other revenues | 26 |  | 74 |  | 58 |  | — |  | — |  | — |  | 158 |
Gas gathering and processing revenues | — |  | 7 |  | — |  | — |  | — |  | — |  | 7 |
Gas distribution revenue | — |  | — |  | 1,534 |  | — |  | — |  | — |  | 1,534 |
Electricity and transmission revenues | — |  | — |  | — |  | 76 |  | — |  | — |  | 76 |
Total revenue from contracts with customers | 2,355 |  | 1,202 |  | 1,808 |  | 76 |  | — |  | — |  | 5,441 |
Commodity sales | — |  | — |  | — |  | — |  | 6,429 |  | — |  | 6,429 |
Other revenues 1,2 | 212 |  | 12 |  | 6 |  | 91 |  | — |  | (4) |  | 317 |
Intersegment revenues | 132 |  | — |  | 9 |  | — |  | 4 |  | (145) |  | — |
Total revenues | 2,699 |  | 1,214 |  | 1,823 |  | 167 |  | 6,433 |  | (149) |  | 12,187 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Three months ended March 31, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 2,440 |  | 1,255 |  | 215 |  | — |  | — |  | — |  | 3,910 |
Storage and other revenues | 26 |  | 79 |  | 47 |  | — |  | — |  | — |  | 152 |
Gas gathering and processing revenues | — |  | 7 |  | — |  | — |  | — |  | — |  | 7 |
Gas distribution revenues | — |  | — |  | 1,417 |  | — |  | — |  | — |  | 1,417 |
Electricity and transmission revenues | — |  | — |  | — |  | 50 |  | — |  | — |  | 50 |
Total revenue from contracts with customers | 2,466 |  | 1,341 |  | 1,679 |  | 50 |  | — |  | — |  | 5,536 |
Commodity sales | — |  | — |  | — |  | — |  | 7,389 |  | — |  | 7,389 |
Other revenues 1,2 | (1,017) |  | 16 |  | (1) |  | 103 |  | (7) |  | (6) |  | (912) |
Intersegment revenues | 85 |  | — |  | 4 |  | — |  | 16 |  | (105) |  | — |
Total revenues | 1,534 |  | 1,357 |  | 1,682 |  | 153 |  | 7,398 |  | (111) |  | 12,013 |
1 Includes mark-to-market gains/(losses) from our hedging program for the three months ended March 31, 2021 and 2020 of $130 million gain and $1,106 million loss, respectively. 2 Includes revenues from lease contracts for the three months ended March 31, 2021 and 2020 of $159 million and $158 million, respectively. Recognition and Measurement of Revenues
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Three months ended March 31, 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 | 2,355 |  | 1,202 |  | 1,791 |  | 76 |  |  | 5,424 |
Total revenue from contracts with customers | 2,355 |  | 1,202 |  | 1,808 |  | 76 |  |  | 5,441 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Three months ended March 31, 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 | 2,466 |  | 1,341 |  | 1,664 |  | 50 |  |  | 5,521 |
Total revenue from contracts with customers | 2,466 |  | 1,341 |  | 1,679 |  | 50 |  |  | 5,536 |
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 March 31, 2021 | 2,120 |  | 214 |  | 1,724 |
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=121604090&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=121604090&loc=SL49130545-203045 + Details
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