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Revenue Recognition - Schedule of Bad Debt Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Bad debt expense | $ 18 | $ 20 | $ 12
Bad debt expense deferred as regulatory asset | 0 | 0 | 16
Houston Electric |  |  |
Bad debt expense | 0 | 0 | 0
Bad debt expense deferred as regulatory asset | 0 | 0 | 8
CERC Corp |  |  |
Bad debt expense | 16 | 17 | 10
Bad debt expense deferred as regulatory asset | $ 0 | $ 0 | $ 8

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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