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Summary of Significant Accounting Policies Nature of Operations (Details) customer in Millions | Dec. 31, 2023 customer
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ATC |
Product Information |
Equity method investment, ownership interest (as a percent) | 60.00%
ATC Holdco |
Product Information |
Equity method investment, ownership interest (as a percent) | 75.00%
Electric |
Product Information |
Number of customers | 1.7
Natural gas |
Product Information |
Number of customers | 3.0

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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