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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill |
| Liquids Pipelines |  | Gas Transmission & Midstream |  | Gas Distribution |  | Green Power and Transmission |  | Energy Services |  | Eliminations and Other |  | Consolidated |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Cost |  |  |  |  |  |  |
Balance at January 1, 2017 | 59 |  | 457 |  | 7 |  | — |  | 2 |  | 13 |  | 538 |
Acquired in Merger Transaction (Note 8) | 8,070 |  | 22,914 |  | 5,672 |  | — |  | — |  | — |  | 36,656 |
Sabal Trail deconsolidation (Note 13) | — |  | (966 | ) | — |  | — |  | — |  | — |  | (966 | )
Disposition | (29 | ) | — |  | — |  | — |  | — |  | — |  | (29 | )
Foreign exchange and other | (314 | ) | (866 | ) | — |  | — |  | — |  | — |  | (1,180 | )
Balance at December 31, 2017 | 7,786 |  | 21,539 |  | 5,679 |  | — |  | 2 |  | 13 |  | 35,019 |
Disposition | — |  | (628 | ) | — |  | — |  | — |  | — |  | (628 | )
Allocation to assets held for sale | — |  | (55 | ) | (133 | ) | — |  | — |  | — |  | (188 | )
Foreign exchange and other | 538 |  | 1,482 |  | (183 | ) | — |  | — |  | — |  | 1,837 |
Balance at December 31, 2018 | 8,324 |  | 22,338 |  | 5,363 |  | — |  | 2 |  | 13 |  | 36,040 |
Accumulated Impairment |  |  |  |  |  |  |
Balance at January 1, 2017 | — |  | (440 | ) | (7 | ) | — |  | — |  | (13 | ) | (460 | )
Impairment | — |  | (102 | ) | — |  | — |  | — |  | — |  | (102 | )
Balance at December 31, 2017 | — |  | (542 | ) | (7 | ) | — |  | — |  | (13 | ) | (562 | )
Impairment | — |  | (1,019 | ) | — |  | — |  | — |  | — |  | (1,019 | )
Balance at December 31, 2018 | — |  | (1,561 | ) | (7 | ) | — |  | — |  | (13 | ) | (1,581 | )
Carrying Value |  |  |  |  |  |  |
Balance at December 31, 2017 | 7,786 |  | 20,997 |  | 5,672 |  | — |  | 2 |  | — |  | 34,457 |
Balance at December 31, 2018 | 8,324 |  | 20,777 |  | 5,356 |  | — |  | 2 |  | — |  | 34,459 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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