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REVENUE (Tables) | 12 Months Ended
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Dec. 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
Year ended December 31, 2021
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 9,492 |  | 4,364 |  | 676 |  | — |  | — |  | — |  | 14,532 |
Storage and other revenue | 147 |  | 255 |  | 246 |  | — |  | — |  | — |  | 648 |
Gas gathering and processing revenue | — |  | 49 |  | — |  | — |  | — |  | — |  | 49 |
Gas distribution revenue | — |  | — |  | 4,026 |  | — |  | — |  | — |  | 4,026 |
Electricity and transmission revenue | — |  | — |  | — |  | 177 |  | — |  | — |  | 177 |
Total revenue from contracts with customers | 9,639 |  | 4,668 |  | 4,948 |  | 177 |  | — |  | — |  | 19,432 |
Commodity sales | — |  | — |  | — |  | — |  | 26,873 |  | — |  | 26,873 |
Other revenue 1,2 | 375 |  | 42 |  | 13 |  | 336 |  | — |  | — |  | 766 |
Intersegment revenue | 567 |  | 1 |  | 19 |  | (1) |  | 44 |  | (630) |  | — |
Total revenue | 10,581 |  | 4,711 |  | 4,980 |  | 512 |  | 26,917 |  | (630) |  | 47,071 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Year ended December 31, 2020
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 9,161 |  | 4,523 |  | 674 |  | — |  | — |  | — |  | 14,358 |
Storage and other revenue | 94 |  | 274 |  | 203 |  | — |  | — |  | — |  | 571 |
Gas gathering and processing revenue | — |  | 27 |  | — |  | — |  | — |  | — |  | 27 |
Gas distribution revenue | — |  | — |  | 3,663 |  | — |  | — |  | — |  | 3,663 |
Electricity and transmission revenue | — |  | — |  | — |  | 198 |  | — |  | — |  | 198 |
Total revenue from contracts with customers | 9,255 |  | 4,824 |  | 4,540 |  | 198 |  | — |  | — |  | 18,817 |
Commodity sales | — |  | — |  | — |  | — |  | 19,259 |  | — |  | 19,259 |
Other revenue 1,2 | 584 |  | 44 |  | 17 |  | 389 |  | — |  | (23) |  | 1,011 |
Intersegment revenue | 584 |  | 2 |  | 12 |  | — |  | 24 |  | (622) |  | — |
Total revenue | 10,423 |  | 4,870 |  | 4,569 |  | 587 |  | 19,283 |  | (645) |  | 39,087 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation | Energy Services | Eliminations and Other | Consolidated
Year ended December 31, 2019
(millions of Canadian dollars) |  |  |  |  |  |  |
Transportation revenue | 9,082 |  | 4,477 |  | 743 |  | — |  | — |  | — |  | 14,302 |
Storage and other revenue | 109 |  | 268 |  | 201 |  | — |  | — |  | — |  | 578 |
Gas gathering and processing revenue | — |  | 423 |  | — |  | — |  | — |  | — |  | 423 |
Gas distribution revenue | — |  | — |  | 4,210 |  | — |  | — |  | — |  | 4,210 |
Electricity and transmission revenue | — |  | — |  | — |  | 180 |  | — |  | — |  | 180 |
Commodity sales | — |  | 4 |  | — |  | — |  | — |  | — |  | 4 |
Total revenue from contracts with customers | 9,191 |  | 5,172 |  | 5,154 |  | 180 |  | — |  | — |  | 19,697 |
Commodity sales | — |  | — |  | — |  | — |  | 29,305 |  | — |  | 29,305 |
Other revenue 1,2 | 659 |  | 30 |  | 9 |  | 387 |  | (2) |  | (16) |  | 1,067 |
Intersegment revenue | 369 |  | 5 |  | 16 |  | — |  | 71 |  | (461) |  | — |
Total revenue | 10,219 |  | 5,207 |  | 5,179 |  | 567 |  | 29,374 |  | (477) |  | 50,069 |
1 Includes mark-to-market gains from our hedging program for the year ended December 31, 2021 of $59 million, (2020 - $265 million, 2019 - $346 million). 2 Includes revenues from lease contracts. Refer to Note 27 - Leases.
Contract with Customer, Asset and Liability |
| Contract Receivables | Contract Assets | Contract Liabilities
(millions of Canadian dollars) |  |  |
Balance as at December 31, 2021 | 2,369 |  | 213 |  | 1,898 |
Balance as at December 31, 2020 | 2,042 |  | 226 |  | 1,815 |
Performance Obligations | Performance Obligations
Segment | Nature of Performance Obligation
Liquids Pipelines | •Transportation and storage of crude oil and natural gas liquids (NGLs)
Gas Transmission and Midstream | •Transportation, storage, gathering, compression and treating of natural gas
•Transportation of NGLs
•Sale of crude oil, natural gas and NGLs
Gas Distribution and Storage | •Supply and delivery of natural gas
•Transportation of natural gas
•Storage of natural gas
Renewable Power Generation | •Generation and transmission of electricity
•Delivery of electricity from renewable energy generation facilities
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | Recognition and Measurement of Revenue
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Year ended December 31, 2021
(millions of Canadian dollars) |  |  |  |  |  |
Revenue from products transferred at a point in time | — |  | — |  | 70 |  | — |  |  | 70 |
Revenue from products and services transferred over time 1 | 9,639 |  | 4,668 |  | 4,878 |  | 177 |  |  | 19,362 |
Total revenue from contracts with customers | 9,639 |  | 4,668 |  | 4,948 |  | 177 |  |  | 19,432 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Year ended December 31, 2020
(millions of Canadian dollars) |  |  |  |  |  |
Revenue from products transferred at a point in time | — |  | — |  | 60 |  | — |  |  | 60 |
Revenue from products and services transferred over time 1 | 9,255 |  | 4,824 |  | 4,480 |  | 198 |  |  | 18,757 |
Total revenue from contracts with customers | 9,255 |  | 4,824 |  | 4,540 |  | 198 |  |  | 18,817 |
| Liquids Pipelines | Gas Transmission and Midstream | Gas Distribution and Storage | Renewable Power Generation |  | Consolidated
Year ended December 31, 2019
(millions of Canadian dollars) |  |  |  |  |  |
Revenue from products transferred at a point in time | — |  | 4 |  | 65 |  | — |  |  | 69 |
Revenue from products and services transferred over time 1 | 9,191 |  | 5,168 |  | 5,089 |  | 180 |  |  | 19,628 |
Total revenue from contracts with customers | 9,191 |  | 5,172 |  | 5,154 |  | 180 |  |  | 19,697 |
1 Revenue 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.

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