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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 05, 2023 USD ($) | Mar. 23, 2023 USD ($) | Jul. 01, 2022 USD ($) | Dec. 31, 2021 lease | Sep. 30, 2023 USD ($) | Jun. 29, 2023 USD ($) | Mar. 24, 2023 USD ($) | Jan. 04, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 19, 2022 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | $ 217 |  |  |  | $ 1,385 |
Regulatory assets noncurrent |  |  |  |  | 2,481 |  |  |  | 2,193 |
Disallowance of regulatory asset |  |  |  |  | 53 |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  | 18 |  |  |  | 18 |
Regulatory asset remaining to recover through rates amount |  |  |  |  | 5 |  |  |  | 11 |
CERC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | 205 |  |  |  | 1,336 |
Regulatory assets noncurrent |  |  |  |  | 833 |  |  |  | 844 |
Regulatory liability, approximate total gas cost |  |  |  |  | 17 |  |  |  | 17 |
Regulatory asset remaining to recover through rates amount |  |  |  |  | 4 |  |  |  | 10 |
Houston Electric |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets noncurrent |  |  |  |  | 775 |  |  |  | 778 |
Disallowance of regulatory asset |  |  |  |  | 53 |  |  |  |  |
Number of leases entered into | lease |  |  |  | 2 |  |  |  |  |  |
Subsidiaries | SIGECO |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  | $ 341 |  |  |
Regulatory asset, issued |  |  |  |  |  | $ 341 |  |  |  |
Minnesota Public Utility Commission | CERC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Disallowance of regulatory asset |  |  |  |  |  |  |  |  |  | $ 36
Attorney General's Office | CERC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 409
IURC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  | $ 350 |  |
Public Utility Commission Of Texas | Houston Electric | TEEEF Lease One |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Recovery of deferred costs sought |  |  | $ 200 |  |  |  |  |  |  |
Annual revenue increase from lease agreements |  |  | $ 57 |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount | $ 39 |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period | 82 months 15 days |  |  |  |  |  |  |  |  |
Public Utility Commission Of Texas | Houston Electric | TEEEF Lease Two |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Annual revenue increase from lease agreements | $ 149 |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount | $ 188 |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period | 78 months |  |  |  |  |  |  |  |  |
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | 92 |  |  |  |  |
February 2021 Winter Storm | REP Bad Debt Expense |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 8 |  |  |  | 8 |
February 2021 Winter Storm | Operation and maintenance expense |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 17 |  |  |  | 16 |
February 2021 Winter Storm | CERC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | 92 |  |  |  |  |
Regulatory assets noncurrent |  |  |  |  | 141 |  |  |  |  |
February 2021 Winter Storm | Houston Electric | REP Bad Debt Expense |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 8 |  |  |  | 8 |
February 2021 Winter Storm | Houston Electric | Operation and maintenance expense |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 17 |  |  |  | 16 |
February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, approximate total gas cost |  |  |  |  | 2,000 |  |  |  |  |
Regulatory assets current |  |  |  |  |  |  |  |  | 1,175 |
Regulatory assets noncurrent |  |  |  |  | 141 |  |  |  | 202 |
Regulatory liability, amount remaining under prudence review |  |  |  |  | $ 75 |  |  |  |  |
February 2021 Winter Storm Event | CERC |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  |  |  |  | 1,175 |
Regulatory assets noncurrent |  |  |  |  |  |  |  |  | $ 202 |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  | $ 1,100 |  |  |  |  |  |  |  |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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