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Related Party Transactions (Houston Electric and CERC) - Schedule of Affiliated-Related Net Interest Income (Expense) (Details) - Other Nonoperating Income (Expense) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Houston Electric
Related Party Transaction [Line Items]
Interest income (expense), net	$ 0	$ 0	$ 0
CERC Corp
Related Party Transaction [Line Items]
Interest income (expense), net	$ (18)	$ (38)	$ (35)

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- Definition

Net interest income (expense) related to affiliate investments or borrowings

+ References

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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

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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