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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Investments in Equity Method Unconsolidated Affiliates | The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment.
| Years Ended December 31,
| 2018 |  | 2017 |  | 2016
|  |  | Equity in |  |  |  |  | Equity in |  |  |  | Equity in |
(in millions) | Investments |  |  | earnings |  |  | Investments |  |  | earnings |  |  | Investments |  | earnings |
Electric Utilities and Infrastructure | $ | 97 |  |  | $ | 6 |  |  | $ | 89 |  |  | $ | 5 |  |  | $ | 93 |  | $ | 5 |
Gas Utilities and Infrastructure | 1,003 |  |  | 27 |  |  | 763 |  |  | 62 |  |  | 566 |  | 19 |
Commercial Renewables | 201 |  |  | (1 | ) |  | 190 |  |  | (5 | ) |  | 185 |  | (82 | )
Other | 108 |  |  | 51 |  |  | 133 |  |  | 57 |  |  | 81 |  | 43 |
Total | $ | 1,409 |  |  | $ | 83 |  |  | $ | 1,175 |  |  | $ | 119 |  |  | $ | 925 |  | $ | (15 | )
The table below outlines Duke Energy's ownership interests in natural gas pipeline companies and natural gas storage facilities.
|  |  | Investment Amount (in millions)
| Ownership |  | December 31, |  | December 31,
Entity Name | Interest |  | 2018 |  | 2017
Pipeline Investments |  |  |  |  |
Atlantic Coast Pipeline, LLC(a) | 47 | % |  | $ | 797 |  |  | $ | 397 |
Sabal Trail Transmission, LLC | 7.5 | % |  | 112 |  | (d) | 219 |
Constitution Pipeline, LLC(a) | 24 | % |  | 25 |  |  | 81 |
Cardinal Pipeline Company, LLC(b) | 21.49 | % |  | 10 |  |  | 11 |
Storage Facilities |  |  |  |  |
Pine Needle LNG Company, LLC(b) | 45 | % |  | 13 |  |  | 13 |
Hardy Storage Company, LLC(b) | 50 | % |  | 46 |  |  | 42 |
Total Investments(c) |  |  | $ | 1,003 |  |  | $ | 763 |
(a) | During the year ended December 31, 2017, Piedmont transferred its share of ownership interest in ACP and Constitution to a wholly owned subsidiary of Duke Energy at book value.
(b) | Piedmont owns the Cardinal, Pine Needle and Hardy Storage investments.
(c) | Duke Energy includes purchase accounting adjustments related to Piedmont.
(d) | Sabal Trail returned capital of $112 million during the year ended December 31, 2018.

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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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