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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | $ 49 | $ (206) | $ 56 | $ (284)
AT&T Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | (10) | (57) | (35) | (94)
Charter Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | 63 | (144) | 88 | (304)
WBD Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | (5) | (5) | 3 | 28
Energy Transfer Common Units |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | 0 | 0 | 0 | 95
Energy Transfer Series G Preferred Units |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | 0 | 0 | 0 | (9)
Other |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | $ 1 | $ 0 | $ 0 | $ 0

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- 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//1943274/2147483586/944-220-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 + Details
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