v3.25.3

Short-term Borrowings and Long-term Debt - Schedule of Revolving Credit Facilities (Details) $ in Millions	9 Months Ended
	Sep. 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)	44.90%
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)	55.10%
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)	39.80%
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)	59.80%
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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CENTERPOINT ENERGY INC 10-Q/A