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Short-term Borrowings and Long-term Debt - Schedule of Utilization of Credit Facilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Aug. 31, 2024	Dec. 31, 2023
Junior Notes | Junior Subordinated Notes Due 2055
Debt Instrument [Line Items]
Weighted Average Interest Rate		7.00%
Junior Notes | Series B Junior Subordinated Notes Due 2055
Debt Instrument [Line Items]
Weighted Average Interest Rate		6.85%
CERC
Debt Instrument [Line Items]
Number of days until commercial paper maturity (in days)	30 days
Loans
Debt Instrument [Line Items]
Long-term line of credit	$ 0		$ 0
Loans | CenterPoint Energy
Debt Instrument [Line Items]
Long-term line of credit	0		0
Loans | SIGECO
Debt Instrument [Line Items]
Long-term line of credit	0		0
Loans | Houston Electric
Debt Instrument [Line Items]
Long-term line of credit	0		0
Loans | CERC
Debt Instrument [Line Items]
Long-term line of credit	0		0
Letters of Credit
Debt Instrument [Line Items]
Long-term line of credit	1		1
Letters of Credit | CenterPoint Energy
Debt Instrument [Line Items]
Long-term line of credit	0		0
Letters of Credit | SIGECO
Debt Instrument [Line Items]
Long-term line of credit	0		0
Letters of Credit | Houston Electric
Debt Instrument [Line Items]
Long-term line of credit	0		0
Letters of Credit | CERC
Debt Instrument [Line Items]
Long-term line of credit	1		1
Commercial Paper
Debt Instrument [Line Items]
Long-term line of credit	1,000		1,520
Commercial Paper | CenterPoint Energy
Debt Instrument [Line Items]
Long-term line of credit	$ 803		$ 1,036
Weighted Average Interest Rate	4.91%		5.54%
Number of days until commercial paper maturity (in days)	60 days
Commercial Paper | SIGECO
Debt Instrument [Line Items]
Long-term line of credit	$ 0		$ 0
Weighted Average Interest Rate	0.00%		0.00%
Commercial Paper | Houston Electric
Debt Instrument [Line Items]
Long-term line of credit	$ 0		$ 0
Weighted Average Interest Rate	0.00%		0.00%
Commercial Paper | CERC
Debt Instrument [Line Items]
Long-term line of credit	$ 197		$ 484
Weighted Average Interest Rate	4.90%		5.53%

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