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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2025
Income Tax Disclosure [Abstract] |
Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate | The following table summarizes the significant factors impacting the difference between the Company's effective tax rate and the federal statutory rate for the three and six months ended June 30 (dollars in millions):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Federal income taxes at statutory rates |  | $ | 3 |  |  |  | 21.0 | % |  | $ | 5 |  |  |  | 21.0 | % |  | $ | 22 |  |  |  | 21.0 | % |  | $ | 20 |  |  |  | 21.0 | %
Increase (decrease) in tax resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Flow through related to deduction of meters and mixed service costs (1) |  |  | (1 | ) |  |  | (7.1 | ) |  |  | (3 | ) |  |  | (12.6 | ) |  |  | (4 | ) |  |  | (3.8 | ) |  |  | (12 | ) |  |  | (12.3 | )
Tax effect of regulatory treatment of utility plant differences |  |  | (1 | ) |  |  | (7.2 | ) |  |  | (1 | ) |  |  | (6.3 | ) |  |  | (6 | ) |  |  | (5.8 | ) |  |  | (6 | ) |  |  | (6.5 | )
State income tax expense |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 0.9 |  |  |  | 1 |  |  |  | 0.7 |
Total income tax expense |  | $ | 1 |  |  |  | 6.7 | % |  | $ | 1 |  |  |  | 2.1 | % |  | $ | 13 |  |  |  | 12.3 | % |  | $ | 3 |  |  |  | 2.9 | %
(1) The Company's general rate cases included approval of base rate increases, offset by tax customer credits. As the tax customer credits are returned to customers, this results in a decrease to income tax expense as a result of flowing through the benefits related to meters and mixed service costs.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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