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LONG-TERM INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Long-Term Investments |
| Ownership |  |  |  |  |
December 31, | Interest |  | 2019 |  | 2018 |
(millions of Canadian dollars) |  |  |  |  |  |
EQUITY INVESTMENTS |  |  |  |  |  |
Liquids Pipelines |  |  |  |  |  |
MarEn Bakken Company L.L.C.1 | 75.0 | % | 1,892 |  | 2,039 |
Gray Oak Holdings L.L.C.2 | 35.0 | % | 463 |  | — |
Seaway Crude Pipeline System | 50.0 | % | 2,907 |  | 3,113 |
Illinois Extension Pipeline Company, L.L.C.3 | 65.0 | % | 662 |  | 724 |
Other | 30.0% - 43.8% |  | 73 |  | 97 |
Gas Transmission and Midstream |  |  |
Alliance Pipeline | 50.0 | % | 310 |  | 368 |
Aux Sable | 42.7% - 50.0% |  | 267 |  | 311 |
DCP Midstream, LLC | 50.0 | % | 2,193 |  | 2,368 |
Gulfstream Natural Gas System, L.L.C. | 50.0 | % | 1,213 |  | 1,289 |
NEXUS Gas Transmission, LLC | 50.0 | % | 1,778 |  | 1,757 |
Offshore - various joint ventures | 22.0% - 74.3% |  | 362 |  | 400 |
PennEast Pipeline Company LLC | 20.0 | % | 106 |  | 97 |
Sabal Trail Transmission, LLC | 50.0 | % | 1,533 |  | 1,586 |
Southeast Supply Header L.L.C. | 50.0 | % | 484 |  | 519 |
Steckman Ridge LP | 49.5 | % | 222 |  | 237 |
Vector Pipeline L.P. | 60.0 | % | 195 |  | 198 |
Other | 33.3% - 50.0% |  | 5 |  | 6 |
Gas Distribution and Storage |  |  |
Noverco Common Shares | 38.9 | % | 95 |  | — |
Other | 50.0 | % | 14 |  | 15 |
Renewable Power Generation |  |  |
Eolien Maritime France SAS | 50.0 | % | 67 |  | 68 |
Enbridge Renewable Infrastructure Investments S.a.r.l.4 | 51.0 | % | 141 |  | 127 |
Rampion Offshore Wind Project | 24.9 | % | 600 |  | 638 |
Other | 21.0% - 50.0% |  | 127 |  | 72 |
Eliminations and Other |  |  |
Other | 42.7% - 50% |  | 16 |  | 10 |
OTHER LONG-TERM INVESTMENTS |  |  |
Gas Distribution and Storage |  |  |
Noverco Preferred Shares |  | 580 |  | 478 |
Renewable Power Generation |  |  |
Emerging Technologies and Other |  | 78 |  | 80 |
Eliminations and Other |  |  |
Other |  | 145 |  | 110 |
|  |  | 16,528 |  | 16,707 |
1 | Owns 49% interest in Bakken Pipeline Investments L.L.C., which owns 75% of the Bakken Pipeline System resulting in a 27.6% effective interest in the Bakken Pipeline System.
2 | In December 2018 we acquired an effective 22.8% interest in the Gray Oak crude oil pipeline through acquisition of a 35% membership interest in Gray Oak Holdings, L.L.C. (Note 12).
3 | Owns the Southern Access Extension Project.
4 | In 2018 we sold a 49% interest in the Hohe See Offshore wind facilities to CPPIB, reducing our effective interest in the project to 25.5%.
Summary of Combined Financial Information | Summarized combined financial information of our interest in unconsolidated equity investments (presented at 100%) is as follows:
| Year Ended December 31,
| 2019 | 2018 | 2017
| Seaway |  | Other |  | Total |  | Seaway |  | Other |  | Total |  | Seaway |  | Other |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |
Operating revenues | 1,252 |  | 14,435 |  | 15,687 |  | 966 |  | 18,251 |  | 19,217 |  | 959 |  | 15,254 |  | 16,213 |
Operating expenses | 428 |  | 12,725 |  | 13,153 |  | 212 |  | 15,422 |  | 15,634 |  | 286 |  | 12,911 |  | 13,197 |
Earnings | 818 |  | 2,198 |  | 3,016 |  | 646 |  | 2,308 |  | 2,954 |  | 672 |  | 2,056 |  | 2,728 |
Earnings attributable to Enbridge | 409 |  | 950 |  | 1,359 |  | 323 |  | 1,059 |  | 1,382 |  | 336 |  | 926 |  | 1,262 |
| December 31, 2019 | December 31, 2018
| Seaway |  | Other |  | Total |  | Seaway |  | Other |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Current assets | 107 |  | 2,374 |  | 2,481 |  | 113 |  | 3,176 |  | 3,289 |
Non-current assets | 3,404 |  | 45,538 |  | 48,942 |  | 3,585 |  | 45,531 |  | 49,116 |
Current liabilities | 136 |  | 3,911 |  | 4,047 |  | 123 |  | 5,413 |  | 5,536 |
Non-current liabilities | 45 |  | 18,081 |  | 18,126 |  | 16 |  | 15,859 |  | 15,875 |
Noncontrolling interests | — |  | 2,779 |  | 2,779 |  | — |  | 3,479 |  | 3,479 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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