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v3.25.2

Short-term Borrowings and Long-term Debt - Schedule of Revolving Credit Facilities (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2025 USD ($)
Debt Instrument [Line Items] |
Size of Facility | $ 4,000
SIGECO |
Debt Instrument [Line Items] |
Size of Facility | 250
Houston Electric |
Debt Instrument [Line Items] |
Size of Facility | 300
CERC |
Debt Instrument [Line Items] |
Size of Facility | $ 1,050
Line of Credit | SIGECO |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.125%
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 45.00%
Line of Credit | Houston Electric |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.25%
Ratio of indebtedness to net capital (as a percent) | 0.675
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 55.70%
Line of Credit | CERC |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.125%
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 38.00%
Parent Company |
Debt Instrument [Line Items] |
Size of Facility | $ 2,400
Parent Company | Line of Credit |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.50%
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 59.50%
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) | 70.00%
Restoration cost expected cost | $ 100
Consecutive period for system restoration costs to exceed $100 million (in months) | 12 months

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