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Revenue Recognition - Schedule of Contract with Customers (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Accounts Receivable |
Opening balance as of December 31, 2023 | $ 652
Closing balance as of December 31, 2024 | 666
Increase (decrease) in accounts receivable | 14
Accrued Unbilled Revenues |
Opening balance as of December 31, 2023 | 516
Closing balance as of December 31, 2024 | 521
Increase (decrease) in other accrued unbilled revenues | 5
Contract Liabilities |
Opening balance as of December 31, 2023 | 2
Closing balance as of December 31, 2024 | 2
Increase (decrease) in contract liabilities | 0
Revenue recognized included in the opening contract liability for the period | 2
Houston Electric |
Accounts Receivable |
Opening balance as of December 31, 2023 | 275
Closing balance as of December 31, 2024 | 284
Increase (decrease) in accounts receivable | 9
Accrued Unbilled Revenues |
Opening balance as of December 31, 2023 | 142
Closing balance as of December 31, 2024 | 137
Increase (decrease) in other accrued unbilled revenues | (5)
Contract Liabilities |
Opening balance as of December 31, 2023 | 2
Closing balance as of December 31, 2024 | 2
Increase (decrease) in contract liabilities | 0
Revenue recognized included in the opening contract liability for the period | 2
CERC |
Accounts Receivable |
Opening balance as of December 31, 2023 | 330
Closing balance as of December 31, 2024 | 326
Increase (decrease) in accounts receivable | (4)
Accrued Unbilled Revenues |
Opening balance as of December 31, 2023 | 329
Closing balance as of December 31, 2024 | 338
Increase (decrease) in other accrued unbilled revenues | $ 9

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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