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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 1999
Debt and Equity Securities, FV-NI [Line Items]
Investment in equity securities	$ 561,000,000	$ 541,000,000
ZENS-Related Securities
Debt and Equity Securities, FV-NI [Line Items]
Investment in equity securities	$ 558,000,000	$ 538,000,000	$ 507,000,000	$ 820,000,000
ZENS debt, due 2029
Debt and Equity Securities, FV-NI [Line Items]
Subordinated note cash exchangeable percentage of fair value	95.00%
Interest Rate	2.00%
Target annual yield on reference shares (as a percent)	2.309%
Contingent principal amount of ZENS	$ 9,000,000
ZENS debt, due 2029
Debt and Equity Securities, FV-NI [Line Items]
Aggregate Principal					$ 1,000,000,000.0
Long-term debt, gross	$ 828,000,000
Subordinated note cash exchangeable percentage of fair value	95.00%
The cash exchange amount from referenced shares per $1,000 face amount of individual notes	$ 640
Face amount of each indexed debt security notes issued by CenterPoint Energy in September 1999	$ 1,000

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Amount of outstanding contingent principal under the zero premium exchangeable subordinated notes contract contingent principal clause.

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The dollar denomination for each individual note

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The percentage of the fair value of the referenced TW Common shares attributable to each note and the percentage of composite fair value each note can be exchanged for cash.

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The target annual yield from interest and cash dividends on reference shares, before any adjustment to increase or decrease principal amount of subordinated note is made.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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