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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 12, 2023 USD ($) | Apr. 05, 2023 USD ($) | Mar. 23, 2023 USD ($) | Dec. 31, 2022 USD ($) lease | Dec. 31, 2023 USD ($) | Jun. 29, 2023 USD ($) | Jan. 04, 2023 USD ($) | Oct. 19, 2022 USD ($) | Jul. 01, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  | $ 1,385 | $ 161 |  |  |  |  |
Regulatory asset, noncurrent |  |  |  | 2,193 | 2,513 |  |  |  |  |
Total regulatory assets |  |  |  | 3,578 | 2,674 |  |  |  |  |
February 2021 Winter Storm | Operation And Maintenance Expense |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total regulatory assets |  |  |  | 16 | 17 |  |  |  |  |
February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  |  |  |  |  | $ 2,000
Regulatory assets current |  |  |  | 1,175 |  |  |  |  |  |
Regulatory asset, noncurrent |  |  |  | 202 | 130 |  |  |  |  |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  | $ 1,100 |  |  |  |  |  |  |
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | 86 |  |  |  |  |
CERC Corp |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  | 1,336 | 161 |  |  |  |  |
Regulatory asset, noncurrent |  |  |  | 844 | 850 |  |  |  |  |
Total regulatory assets |  |  |  | 2,180 | 1,011 |  |  |  |  |
CERC Corp | Minnesota Service Territory |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  |  |  | $ 409 |  |
CERC Corp | February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  | 1,175 |  |  |  |  |  |
Regulatory asset, noncurrent |  |  |  | 202 | 130 |  |  |  |  |
CERC Corp | February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  | $ 1,100 |  |  |  |  |  |  |
CERC Corp | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  | 86 |  |  |  |  |
Houston Electric |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  | 0 | 0 |  |  |  |  |
Regulatory asset, noncurrent |  |  |  | 778 | 752 |  |  |  |  |
Total regulatory assets |  |  |  | $ 778 | 752 |  |  |  |  |
Number of leases entered into | lease |  |  |  | 2 |  |  |  |  |  |
Houston Electric | February 2021 Winter Storm | Operation And Maintenance Expense |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total regulatory assets |  |  |  | $ 16 | $ 17 |  |  |  |  |
Subsidiaries | SIGECO |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, issued |  |  |  |  |  | $ 341 |  |  |  |
IURC |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  | $ 350 |  |  |
Minnesota Public Utility Commission | CERC Corp |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Disallowance of regulatory asset |  |  |  |  |  |  |  | $ 36 |  |
Public Utility Commission of Texas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total regulatory assets |  |  |  | 8 |  |  |  |  |  |
Public Utility Commission of Texas | Houston Electric |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total regulatory assets |  |  |  | $ 8 |  |  |  |  |  |
Public Utility Commission Of Texas | Houston Electric |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Recovery of deferred costs sought |  |  |  |  |  |  |  |  | $ 200 |
Public Utility Commission Of Texas | Houston Electric | TEEEF Lease One |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount |  | $ 39 |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  | 82 months 15 days |  |  |  |  |  |  |  |
Public Utility Commission Of Texas | Houston Electric | TEEEF Lease Two |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period | 102 months | 78 months |  |  |  |  |  |  |  |
Annual revenue increase from lease agreements |  | $ 149 |  |  |  |  |  |  |  |
Regulatory Asset, Total Revenue Requirement Amount |  | $ 188 |  |  |  |  |  |  |  |
Regulatory Asset, Revenue Requirement Amount Reduction | $ 35 |  |  |  |  |  |  |  |  |

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