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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
| 2020 |  | 2019 |  | 2018
|  |  | Equity in |  |  |  | Equity in |  |  |  | Equity in
(in millions) | Investments |  | earnings |  | Investments |  | earnings |  | Investments |  | earnings
Electric Utilities and Infrastructure | $ | 105 |  |  | $ | (1) |  |  | $ | 122 |  |  | $ | 9 |  |  | $ | 97 |  |  | $ | 6 |
Gas Utilities and Infrastructure | 215 |  |  | (2,017) |  |  | 1,388 |  |  | 114 |  |  | 1,003 |  |  | 27 |
Commercial Renewables | 534 |  |  | — |  |  | 314 |  |  | (4) |  |  | 201 |  |  | (1) |
Other | 107 |  |  | 13 |  |  | 112 |  |  | 43 |  |  | 108 |  |  | 51 |
Total | $ | 961 |  |  | $ | (2,005) |  |  | $ | 1,936 |  |  | $ | 162 |  |  | $ | 1,409 |  |  | $ | 83 |
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, |
Entity Name | Interest |  | 2020 |  | 2019 |
Pipeline Investments(a) |  |  |  |  |  |
ACP(b) | 47 | % |  | $ | — |  |  | $ | 1,179 |  |
Sabal Trail | 7.5 | % |  | 120 |  |  | 121 |  |
Cardinal(c) | 21.49 | % |  | 9 |  |  | 9 |  |
Storage Facilities |  |  |  |  |  |
Pine Needle(c) | 45 | % |  | 27 |  |  | 28 |  |
Hardy Storage(c) | 50 | % |  | 56 |  |  | 51 |  |
Other | 29.68 | % |  | 3 |  |  | — |  |
Total Investments(d) |  |  | $ | 215 |  |  | $ | 1,388 |  |
(a) Duke Energy recorded OTTIs of $25 million and $55 million within Equity in (losses) earnings of unconsolidated affiliates on Duke Energy's Consolidated Statements of Operations for the years ended December 31, 2019, and 2018, respectively, to completely impair its 24% ownership interest in Constitution. (b) In 2020, Duke Energy determined it would no longer continue its investment in the construction of the ACP pipeline. See Notes 3 and 7 for further information. (c) Piedmont owns the Cardinal, Pine Needle and Hardy Storage investments. (d) Duke Energy includes purchase accounting adjustments related to Piedmont. For the year ended December 31, 2020, Duke Energy's investment in ACP met the requirements of S-X Rule 4-08(g) to provide summarized financial information. The following table provides summary information for ACP as required under S-X Rule 1-02(bb) for the comparative periods in Duke Energy's consolidated balance sheets and consolidated statements of operations.
|  |  | December 31,
(in millions) |  |  | 2020 |  | 2019
Current assets |  |  | $ | 43 |  |  | $ | 17 |
Noncurrent assets |  |  | 93 |  |  | 4,091 |
Current liabilities |  |  | 1,965 |  |  | 37 |
Noncurrent liabilities |  |  | 167 |  |  | 1,760 |
Membership interests |  |  | (1,996) |  |  | 2,311 |
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Net revenues | $ | — |  |  | $ | — |  |  | $ | — |
Operating loss | (4,612) |  |  | (5) |  |  | (6) |
Net (loss) income | (4,512) |  |  | 246 |  |  | 138 |
Net (loss) income attributable to Duke Energy | $ | (2,121) |  |  | $ | 116 |  |  | $ | 65 |

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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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