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REVENUE (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
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, 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 |
| Liquids Pipelines |  | Gas Transmission and Midstream |  | Gas Distribution and Storage |  | Renewable Power Generation |  | Energy Services |  | Eliminations and Other |  | Consolidated |
Year ended December 31, 2018
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |  |  |
Transportation revenue | 8,488 |  | 3,928 |  | 875 |  | — |  | — |  | — |  | 13,291 |
Storage and other revenue | 101 |  | 222 |  | 196 |  | — |  | — |  | — |  | 519 |
Gas gathering and processing revenue | — |  | 815 |  | — |  | — |  | — |  | — |  | 815 |
Gas distribution revenue | — |  | — |  | 4,376 |  | — |  | — |  | — |  | 4,376 |
Electricity and transmission revenue | — |  | — |  | — |  | 206 |  | — |  | — |  | 206 |
Commodity sales | — |  | 1,590 |  | — |  | — |  | — |  | — |  | 1,590 |
Total revenue from contracts with customers | 8,589 |  | 6,555 |  | 5,447 |  | 206 |  | — |  | — |  | 20,797 |
Commodity sales | — |  | — |  | — |  | — |  | 26,070 |  | — |  | 26,070 |
Other revenue 1,2 | (894 | ) | 6 |  | 9 |  | 361 |  | 4 |  | 25 |  | (489 | )
Intersegment revenue | 384 |  | 10 |  | 14 |  | — |  | 154 |  | (562 | ) | — |
Total revenue | 8,079 |  | 6,571 |  | 5,470 |  | 567 |  | 26,228 |  | (537 | ) | 46,378 |
1 | Includes mark-to-market gains/(losses) from our hedging program.
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, 2018 | 1,929 |  | 191 |  | 1,297 |
Balance as at December 31, 2019 | 2,099 |  | 216 |  | 1,424 |
Performance Obligations | Performance Obligations
Segment | Nature of Performance Obligation
Liquids Pipelines | • Transportation and storage of crude oil and 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 |  | Energy Services |  | 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.
| Liquids Pipelines |  | Gas Transmission and Midstream |  | Gas Distribution and Storage |  | Renewable Power Generation |  | Energy Services |  | Consolidated |
Year ended December 31, 2018
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |
Revenue from products transferred at a point in time 1 | — |  | 1,590 |  | 68 |  | — |  | — |  | 1,658 |
Revenue from products and services transferred over time 2 | 8,589 |  | 4,965 |  | 5,379 |  | 206 |  | — |  | 19,139 |
Total revenue from contracts with customers | 8,589 |  | 6,555 |  | 5,447 |  | 206 |  | — |  | 20,797 |
1 | Revenue from sales of crude oil, natural gas and NGLs. Revenue from commodity sales where the commodity sold is not immediately consumed prior to use is recognized at the point in time when the contractually specified volume of the commodity has been delivered.
2 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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