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Related Party Transactions (Houston Electric and CERC) - Schedule of Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | $ 367 | $ 316 | $ 0
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses | 0 | 0 | 0
Other Significant Noncash Transaction, Value of Consideration Given | 0 | 38 | 0
Cash paid to parent for property, plant and equipment below | 0 | 65 | 0
Property, plant and equipment from parent | 0 | 103 | 0
Houston Electric | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Cash contribution from parent | 885 | 1,143 | 130
Net assets acquired in the Restructuring | 0 | 0 | 0
CERC Corp |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | 496 | 124 | 0
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses | 0 | 720 | 0
Other Significant Noncash Transaction, Value of Consideration Given | 0 | 54 | 0
Cash paid to parent for property, plant and equipment below | 0 | 61 | 0
Property, plant and equipment from parent | 0 | 115 | 0
CERC Corp | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Cash contribution from parent | 500 | 289 | 140
Net assets acquired in the Restructuring | $ 0 | $ 2,345 | $ 0

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- Definition The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
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