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REVENUES (Tables) | 9 Months Ended
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Sep. 30, 2020
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 September 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 2,234 |  | 1,077 |  | 128 |  | — |  | — |  | — |  | 3,439 |
Storage and other revenues | 22 |  | 64 |  | 51 |  | — |  | — |  | — |  | 137 |
Gas gathering and processing revenues | — |  | 7 |  | — |  | — |  | — |  | — |  | 7 |
Gas distribution revenue | — |  | — |  | 448 |  | — |  | — |  | — |  | 448 |
Electricity and transmission revenues | — |  | — |  | — |  | 46 |  | — |  | — |  | 46 |
Total revenue from contracts with customers | 2,256 |  | 1,148 |  | 627 |  | 46 |  | — |  | — |  | 4,077 |
Commodity sales | — |  | — |  | — |  | — |  | 4,595 |  | — |  | 4,595 |
Other revenues 1,2 | 360 |  | 14 |  | (8) |  | 80 |  | (3) |  | (5) |  | 438 |
Intersegment revenues | 157 |  | — |  | 2 |  | — |  | 4 |  | (163) |  | — |
Total revenues | 2,773 |  | 1,162 |  | 621 |  | 126 |  | 4,596 |  | (168) |  | 9,110 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Three months ended September 30, 2019
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 2,305 |  | 1,073 |  | 135 |  | — |  | — |  | — |  | 3,513 |
Storage and other revenues | 31 |  | 69 |  | 48 |  | — |  | — |  | — |  | 148 |
Gas gathering and processing revenues | — |  | 98 |  | — |  | — |  | — |  | — |  | 98 |
Gas distribution revenues | — |  | — |  | 470 |  | — |  | — |  | — |  | 470 |
Electricity and transmission revenues | — |  | — |  | — |  | 46 |  | — |  | — |  | 46 |
Total revenue from contracts with customers | 2,336 |  | 1,240 |  | 653 |  | 46 |  | — |  | — |  | 4,275 |
Commodity sales | — |  | — |  | — |  | — |  | 7,396 |  | — |  | 7,396 |
Other revenues 1,2 | (156) |  | 23 |  | (21) |  | 82 |  | (1) |  | — |  | (73) |
Intersegment revenues | 88 |  | 1 |  | 3 |  | — |  | 8 |  | (100) |  | — |
Total revenues | 2,268 |  | 1,264 |  | 635 |  | 128 |  | 7,403 |  | (100) |  | 11,598 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Nine months ended September 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 6,815 |  | 3,458 |  | 494 |  | — |  | — |  | — |  | 10,767 |
Storage and other revenues | 72 |  | 209 |  | 154 |  | — |  | — |  | — |  | 435 |
Gas gathering and processing revenues | — |  | 19 |  | — |  | — |  | — |  | — |  | 19 |
Gas distribution revenue | — |  | — |  | 2,551 |  | — |  | — |  | — |  | 2,551 |
Electricity and transmission revenues | — |  | — |  | — |  | 150 |  | — |  | — |  | 150 |
Total revenue from contracts with customers | 6,887 |  | 3,686 |  | 3,199 |  | 150 |  | — |  | — |  | 13,922 |
Commodity sales | — |  | — |  | — |  | — |  | 14,920 |  | — |  | 14,920 |
Other revenues 1,2 | (59) |  | 35 |  | (1) |  | 279 |  | 1 |  | (18) |  | 237 |
Intersegment revenues | 424 |  | 1 |  | 8 |  | — |  | 22 |  | (455) |  | — |
Total revenues | 7,252 |  | 3,722 |  | 3,206 |  | 429 |  | 14,943 |  | (473) |  | 29,079 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Nine months ended September 30, 2019
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenues | 6,749 |  | 3,323 |  | 555 |  | — |  | — |  | — |  | 10,627 |
Storage and other revenues | 83 |  | 168 |  | 154 |  | — |  | — |  | — |  | 405 |
Gas gathering and processing revenues | — |  | 329 |  | — |  | — |  | — |  | — |  | 329 |
Gas distribution revenues | — |  | — |  | 3,080 |  | — |  | — |  | — |  | 3,080 |
Electricity and transmission revenues | — |  | — |  | — |  | 139 |  | — |  | — |  | 139 |
Commodity sales | — |  | 3 |  | — |  | — |  | — |  | — |  | 3 |
Total revenue from contracts with customers | 6,832 |  | 3,823 |  | 3,789 |  | 139 |  | — |  | — |  | 14,583 |
Commodity sales | — |  | — |  | — |  | — |  | 22,441 |  | — |  | 22,441 |
Other revenues 1,2 | 383 |  | 43 |  | 5 |  | 278 |  | (2) |  | (14) |  | 693 |
Intersegment revenues | 280 |  | 4 |  | 9 |  | — |  | 55 |  | (348) |  | — |
Total revenues | 7,495 |  | 3,870 |  | 3,803 |  | 417 |  | 22,494 |  | (362) |  | 37,717 |
1 Includes mark-to-market gains/(losses) from our hedging program for the three months ended September 30, 2020 and 2019 of $276 million gain and $236 million loss, respectively, and for the nine months ended September 30, 2020 and 2019 of $298 million loss and $148 million gain, respectively. 2 Includes revenues from lease contracts for the three months ended September 30, 2020 and 2019 of $144 million and $143 million, respectively, and for the nine months ended September 30, 2020 and 2019 of $459 million and $458 million, respectively. Recognition and Measurement of Revenues
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Consolidated
Three months ended September 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 | 2,256 |  | 1,148 |  | 612 |  | 46 |  | — |  | 4,062 |
Total revenue from contracts with customers | 2,256 |  | 1,148 |  | 627 |  | 46 |  | — |  | 4,077 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Consolidated
Three months ended September 30, 2019
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 17 |  | — |  | — |  | 17 |
Revenues from products and services transferred over time 1 | 2,336 |  | 1,240 |  | 636 |  | 46 |  | — |  | 4,258 |
Total revenue from contracts with customers | 2,336 |  | 1,240 |  | 653 |  | 46 |  | — |  | 4,275 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Consolidated
Nine months ended September 30, 2020
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | — |  | 45 |  | — |  | — |  | 45 |
Revenues from products and services transferred over time 1 | 6,887 |  | 3,686 |  | 3,154 |  | 150 |  | — |  | 13,877 |
Total revenue from contracts with customers | 6,887 |  | 3,686 |  | 3,199 |  | 150 |  | — |  | 13,922 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Consolidated
Nine months ended September 30, 2019
(millions of Canadian dollars) |  |  |  |  |  |
Revenues from products transferred at a point in time | — |  | 3 |  | 51 |  | — |  | — |  | 54 |
Revenues from products and services transferred over time 1 | 6,832 |  | 3,820 |  | 3,738 |  | 139 |  | — |  | 14,529 |
Total revenue from contracts with customers | 6,832 |  | 3,823 |  | 3,789 |  | 139 |  | — |  | 14,583 |
1 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
| Receivables | Contract Assets | Contract Liabilities
(millions of Canadian dollars) |  |  |
Balance as at December 31, 2019 | 2,099 |  | 216 |  | 1,424 |
Balance as at September 30, 2020 | 1,499 |  | 236 |  | 1,691 |

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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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