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Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 3 | $ 5 | $ 22 | $ 20
Flow through related to deduction of meters and mixed service costs | (1) | (3) | (4) | (12)
Tax effect of regulatory treatment of utility plant differences | (1) | (1) | (6) | (6)
State income tax expense | 0 | 0 | 1 | 1
Total income tax expense | $ 1 | $ 1 | $ 13 | $ 3
Federal income taxes at statutory rates | 21.00% | 21.00% | 21.00% | 21.00%
Flow through related to deduction of meters and mixed service costs | (7.10%) | (12.60%) | (3.80%) | (12.30%)
Tax effect of regulatory treatment of utility plant differences | (7.20%) | (6.30%) | (5.80%) | (6.50%)
State income tax expense | 0.00% | 0.00% | 0.90% | 0.70%
Total income tax expense | 6.70% | 2.10% | 12.30% | 2.90%

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