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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Gain (Loss) On Equity Securities (CenterPoint Energy) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt and Equity Securities, FV-NI [Line Items]
Gain (loss) on equity securities	$ 54	$ 49	$ (10)	$ 56
AT&T Common
Debt and Equity Securities, FV-NI [Line Items]
Gain (loss) on equity securities	29	(10)	53	(35)
Charter Common
Debt and Equity Securities, FV-NI [Line Items]
Gain (loss) on equity securities	22	63	(56)	88
WBD Common
Debt and Equity Securities, FV-NI [Line Items]
Gain (loss) on equity securities	3	(5)	(7)	3
Other
Debt and Equity Securities, FV-NI [Line Items]
Gain (loss) on equity securities	$ 0	$ 1	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B

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