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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Income Tax Contingency [Line Items] |  |
Effective income tax rate (as a percent) | 19.00% | 27.00%
Net uncertain tax liability | $ 28 |
Houston Electric |  |
Income Tax Contingency [Line Items] |  |
Effective income tax rate (as a percent) | 23.00% | 22.00%
CERC |  |
Income Tax Contingency [Line Items] |  |
Effective income tax rate (as a percent) | 22.00% | 25.00%

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- Definition Amount recognized for uncertainty in income taxes classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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