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Derivative Instruments - Interest Rate Hedging and Weather Hedges (Details) - Interest rate derivatives - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Cash Flow Hedge
Derivative [Line Items]
Economic hedge	$ 0	$ 200
Cash Flow Hedge | Houston Electric
Derivative [Line Items]
Economic hedge	0	100
Economic hedge
Derivative [Line Items]
Economic hedge	150	0
Economic hedge | Houston Electric
Derivative [Line Items]
Economic hedge	$ 150	$ 0

X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
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-Section 50
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