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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue |
| Liquids Pipelines |  | Gas Transmission and Midstream |  | Gas Distribution |  | Green Power and Transmission |  | 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 | — |  | — |  | — |  | 559 |  | — |  | — |  | 559 |
Commodity sales | — |  | 1,590 |  | — |  | — |  | — |  | — |  | 1,590 |
Total revenue from contracts with customers | 8,589 |  | 6,555 |  | 5,447 |  | 559 |  | — |  | — |  | 21,150 |
Commodity sales | — |  | — |  | — |  | — |  | 26,070 |  | — |  | 26,070 |
Other revenue 1 | (894 | ) | 6 |  | 9 |  | 8 |  | 4 |  | 25 |  | (842 | )
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.
Contract with Customer, Asset and Liability |
| Receivables |  | Contract Assets |  | Contract Liabilities |
(millions of Canadian dollars) |  |  |
Balance as at January 1, 2018 | 2,475 |  | 290 |  | 992 |
Balance as at December 31, 2018 | 1,929 |  | 191 |  | 1,245 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The below table presents the cumulative, immaterial effect of the adoption of ASC 606 on our Consolidated Statement of Financial Position as at January 1, 2018 on each affected financial statement line item. For the year ended December 31, 2018, the effect of the adoption of ASC 606 on our Consolidated Statement of Earnings was not material.
| Balance at December 31, 2017 |  | Adjustments Due to ASC 606 |  | Balance at January 1, 2018 |
(millions of Canadian dollars) |  |  |
Assets |  |  |
Deferred amounts and other assets | 6,442 |  | (170 | ) | 6,272 |
Property, plant and equipment, net | 90,711 |  | 112 |  | 90,823 |
Liabilities and equity |  |  |
Accounts payable and other | 9,478 |  | 62 |  | 9,540 |
Other long-term liabilities | 7,510 |  | 66 |  | 7,576 |
Deferred income taxes | 9,295 |  | (62 | ) | 9,233 |
Redeemable noncontrolling interests | 4,067 |  | (38 | ) | 4,029 |
Deficit | (2,468 | ) | (86 | ) | (2,554 | )
| Liquids Pipelines |  | Gas Transmission and Midstream |  | Gas Distribution |  | Green Power and Transmission |  | 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 |  | 559 |  | — |  | 19,492 |
Total revenue from contracts with customers | 8,589 |  | 6,555 |  | 5,447 |  | 559 |  | — |  | 21,150 |
1 | Revenue from sales of crude oil, natural gas and NGLs.
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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