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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Gain (Loss) On Equity Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	$ 20	$ 31	$ (227)
AT&T Common
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	62	(17)	(63)
Charter Common
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	(40)	43	(273)
WBD Common
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	(2)	5	23
Energy Transfer Common Units
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	0	0	95
Energy Transfer Series G Preferred Units
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized gains (losses) on equity securities, net	$ 0	$ 0	$ (9)

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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