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Revenue Recognition - Schedule of Contract With Customers (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Accounts Receivable |
Opening balance as of December 31, 2024 | $ 666
Closing balance as of September 30, 2025 | 703
Increase (decrease) in accounts receivable | 37
Accrued Unbilled Revenues |
Opening balance as of December 31, 2024 | 521
Closing balance as of September 30, 2025 | 448
Increase (decrease) in other accrued unbilled revenues | (73)
Houston Electric |
Accounts Receivable |
Opening balance as of December 31, 2024 | 284
Closing balance as of September 30, 2025 | 422
Increase (decrease) in accounts receivable | 138
Accrued Unbilled Revenues |
Opening balance as of December 31, 2024 | 137
Closing balance as of September 30, 2025 | 270
Increase (decrease) in other accrued unbilled revenues | 133
CERC |
Accounts Receivable |
Opening balance as of December 31, 2024 | 326
Closing balance as of September 30, 2025 | 218
Increase (decrease) in accounts receivable | (108)
Accrued Unbilled Revenues |
Opening balance as of December 31, 2024 | 338
Closing balance as of September 30, 2025 | 119
Increase (decrease) in other accrued unbilled revenues | $ (219)

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- Definition Accounts Receivable For Contracts With Customers + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Change in Accounts Receivable [Roll Forward] + References No definition available. + Details
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Balance Type: | na
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- Definition Change in Other Accrued Unbilled Revenues [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | cnp_
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- Definition Increase (Decrease) In Accounts Receivable On Contracts With Customers + References No definition available. + Details
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Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Increase (Decrease) In Contract With Customer, Asset, Other Accrued Unbilled Receivables + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 912 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478345/912-310-45-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |