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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
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Mar. 31, 2023 | Mar. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | $ 38 | $ (17)
AT&T Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | 9 | (10)
Charter Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | 16 | (93)
WBD Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | 14 | 0
Energy Transfer Common Units |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | 0 | 95
Energy Transfer Series G Preferred Units |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | 0 | (9)
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gain (loss) on equity securities | $ (1) | $ 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714 + Details
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