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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 1999
Debt and Equity Securities, FV-NI [Line Items]
Unrealized (losses) gains	$ 38	$ 103
Subordinated Debt ZENS
Debt and Equity Securities, FV-NI [Line Items]
Principal amount of ZENS issued or outstanding	$ 828		$ 1,000
Subordinated note cash exchangeable percentage of fair value (as a percent)	95.00%
ZENS annual interest rate (as a percent)	2.00%
Target annual yield on reference shares (as a percent)	2.309%
Contingent principal amount of ZENS	$ 24

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- Definition

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

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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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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