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Summary of Significant Accounting Policies Nature of Operations (Details) customer in Millions | Dec. 31, 2022 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 | 1.6
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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