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REVENUES (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue
Major Products and Services
Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable Power Generation Energy ServicesEliminations and OtherConsolidated
Three months ended
June 30, 2021
(millions of Canadian dollars)       
Transportation revenue2,157 1,046 150 — — — 3,353 
Storage and other revenue37 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 revenue1,2
215 9 12 77 1 6 320 
Intersegment revenue138 — 15 — 10 (163)— 
Total revenue2,547 1,128 953 132 6,345 (157)10,948 
Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable Power Generation Energy ServicesEliminations and OtherConsolidated
Three months ended
June 30, 2020
(millions of Canadian dollars)       
Transportation revenue2,141 1,126 151 — — — 3,418 
Storage and other revenue24 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 revenue1,2
598 5 8 96 11 (7)711 
Intersegment revenue182 1 2 — 2 (187)— 
Total revenue2,945 1,203 903 150 2,949 (194)7,956 

Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable Power Generation Energy ServicesEliminations and OtherConsolidated
Six months ended
June 30, 2021
(millions of Canadian dollars)       
Transportation revenue4,486 2,167 366 — — — 7,019 
Storage and other revenue63 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 revenue1,2
427 21 18 168 1 2 637 
Intersegment revenue270 — 24 — 14 (308)— 
Total revenue5,246 2,342 2,776 249 12,778 (306)23,085 
Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable Power Generation Energy ServicesEliminations and OtherConsolidated
Six months ended
June 30, 2020
(millions of Canadian dollars)       
Transportation revenue4,581 2,381 366 — — — 7,328 
Storage and other revenue50 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 revenue1,2
(419)21 7 199 4 (13)(201)
Intersegment revenue267 1 6 — 18 (292)— 
Total revenue4,479 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 PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable 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 time1
2,194 1,119 909 55 4,277 
Total revenue from contracts with customers
2,194 1,119 926 55 4,294 

Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable 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 time1
2,165 1,197 878 54 4,294 
Total revenue from contracts with customers
2,165 1,197 893 54 4,309 

Liquids PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable 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 time1
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 PipelinesGas Transmission and MidstreamGas Distribution and StorageRenewable 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 time1
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 ReceivablesContract AssetsContract Liabilities
(millions of Canadian dollars)
Balance as at June 30, 20211,755 213 1,708 
Balance as at December 31, 20202,042 226 1,815