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Investments in Unconsolidated Affiliates | 12 Months Ended
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Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract] |
Investments in Unconsolidated Affiliates | INVESTMENTS IN UNCONSOLIDATED AFFILIATES EQUITY METHOD INVESTMENTS Investments in affiliates that are not controlled by Duke Energy, but over which it has significant influence, are accounted for using the equity method. 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, for periods presented in this filing.
| Years Ended December 31,
| 2021 |  | 2020 |  |  |  | 2019
|  |  | Equity in |  |  |  | Equity in |  |  |  | Equity in
|  |  | earnings |  |  |  | earnings |  |  |  | earnings
(in millions) | Investments |  | (losses) |  | Investments |  | (losses) |  |  |  | (losses)
Electric Utilities and Infrastructure | $ | 104 |  |  | $ | 7 |  |  | $ | 105 |  |  | $ | (1) |  |  |  |  | $ | 9 |
Gas Utilities and Infrastructure | 231 |  |  | 8 |  |  | 215 |  |  | (2,017) |  |  |  |  | 114 |
Commercial Renewables | 513 |  |  | (34) |  |  | 534 |  |  | — |  |  |  |  | (4) |
Other | 122 |  |  | 47 |  |  | 107 |  |  | 13 |  |  |  |  | 43 |
Total | $ | 970 |  |  | $ | 28 |  |  | $ | 961 |  |  | $ | (2,005) |  |  |  |  | $ | 162 |
During the years ended December 31, 2021, 2020 and 2019, Duke Energy received distributions from equity investments of $80 million, $37 million and $55 million, respectively, which are included in Other assets within Cash Flows from Operating Activities on the Consolidated Statements of Cash Flows. During the years ended December 31, 2021, 2020 and 2019, Duke Energy received distributions from equity investments of $44 million, $133 million and $11 million, respectively, which are included in Return of investment capital within Cash Flows from Investing Activities on the Consolidated Statements of Cash Flows. During the years ended December 31, 2021, 2020 and 2019, Piedmont received distributions from equity investments of $8 million, $2 million and $1 million, respectively, which are included in Other assets within Cash Flows from Operating Activities and $2 million, $2 million and $4 million, respectively, which are included within Cash Flows from Investing Activities on the Consolidated Statements of Cash Flows. Significant investments in affiliates accounted for under the equity method are discussed below. Electric Utilities and Infrastructure Duke Energy owns 50% interests in both DATC and Pioneer, which build, own and operate electric transmission facilities in North America. Gas Utilities and Infrastructure Pipeline Investments Piedmont owns a 21.49% investment in Cardinal, an intrastate pipeline located in North Carolina. Duke Energy owns a 7.5% interest in Sabal Trail, a 517-mile interstate natural gas pipeline, which provides natural gas to Duke Energy Florida and Florida Power and Light. Duke Energy recorded OTTIs of $25 million within Equity in earnings (losses) of unconsolidated affiliates on Duke Energy's Consolidated Statements of Operations for the year ended December 31, 2019, to completely impair its 24% ownership interest in Constitution. Duke Energy owns a 47% interest in the ACP pipeline. 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. Storage Facilities Piedmont owns a 45% interest in Pine Needle, an interstate LNG storage facility located in North Carolina, and a 50% interest in Hardy Storage, an underground interstate natural gas storage facility located in West Virginia. Renewable Natural Gas Investments Duke Energy owns a 29.68% investment in SustainRNG, a developer of renewable natural gas projects, and a 70% interest in Sustain T&W, SustainRNG's renewable natural gas project located in Georgia.
Commercial Renewables DS Cornerstone, LLC, which owns wind farm projects in the U.S. was part of a sale of minority interest in a certain portion of renewable assets in 2019. See Note 1 for more information on the sale. Prior to the sale, Duke Energy had a 50% interest in DS Cornerstone, LLC. Subsequent to the sale, Duke Energy has a 26% interest in the investment. In 2020, Duke Energy completed its acquisition of 70 distributed fuel cell projects from Bloom Energy Corporation, which approximates 43 MW of capacity serving commercial and industrial customers across the U.S. Duke Energy is not the primary beneficiary of the distributed fuel cell portfolio and does not consolidate these assets. Other Duke Energy has a 17.5% indirect economic ownership interest and a 25% board representation and voting rights interest in NMC, which owns and operates a methanol and MTBE business in Jubail, Saudi Arabia. Significant Subsidiaries 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 period of significance and comparative prior year periods in Duke Energy's consolidated balance sheets and consolidated statements of operations. For the year ended December 31, 2021, there were no investments that met the significance requirements.
(in millions) |  |  |  |  | December 31, 2020
Current assets |  |  |  |  | $ | 43 |
Noncurrent assets |  |  |  |  | 93 |
Current liabilities |  |  |  |  | 1,965 |
Noncurrent liabilities |  |  |  |  | 167 |
Membership interests |  |  |  |  | (1,996) |
|  |  | Years Ended December 31,
|  |  | 2020 |  | 2019
Net revenues |  |  | $ | — |  |  | $ | — |
Operating loss |  |  | (4,612) |  |  | (5) |
Net (loss) income |  |  | (4,512) |  |  | 246 |
Net (loss) income attributable to Duke Energy |  |  | $ | (2,121) |  |  | $ | 116 |

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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