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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 05, 2023 USD ($) | Mar. 23, 2023 USD ($) | Oct. 13, 2022 USD ($) | Jul. 01, 2022 USD ($) | Dec. 31, 2021 lease | Mar. 31, 2023 USD ($) | Mar. 24, 2023 USD ($) | Jan. 04, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 19, 2022 USD ($) | May 10, 2022 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  | $ 269 |  |  | $ 1,385 |  |
Regulatory assets noncurrent |  |  |  |  |  | 2,499 |  |  | 2,193 |  |
Disallowance of regulatory asset |  |  |  |  |  | 53 |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  | $ 350 |  |  |  |
Regulatory Asset Remaining To Recover Through Rates Amount |  |  |  |  |  | 8 |  |  | 11 |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  | 17 |  |  | 17 |  |
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  | 102 |  |  |  |  |
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 |  |  |  |  |  | 16 |  |  |  |  |
CERC |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  | 227 |  |  | 1,336 |  |
Regulatory assets noncurrent |  |  |  |  |  | 833 |  |  | 844 |  |
Regulatory Asset Remaining To Recover Through Rates Amount |  |  |  |  |  | 8 |  |  | 10 |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  | 17 |  |  | 17 |  |
CERC | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  | 102 |  |  |  |  |
Regulatory assets noncurrent |  |  |  |  |  | 161 |  |  |  |  |
Houston Electric |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets noncurrent |  |  |  |  |  | 818 |  |  | 778 |  |
Disallowance of regulatory asset |  |  |  |  |  | 53 |  |  |  |  |
Number of leases entered into | lease |  |  |  |  | 2 |  |  |  |  |  |
Regulatory asset, revenue requirement amount |  |  | $ 39 |  |  |  |  |  |  |  |
Houston Electric | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount | $ 188 |  |  |  |  |  |  |  |  |  |
Houston Electric | February 2021 Winter Storm | REP Bad Debt Expense |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 8 |  |  | 8 |  |
Houston Electric | February 2021 Winter Storm | Operation and maintenance expense |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 16 |  |  |  |  |
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, estimated qualified costs |  |  |  |  |  |  |  |  |  |  | $ 360
Regulatory asset, financed qualified costs |  |  |  |  |  |  |  |  |  |  | 350
Regulatory asset, estimated ongoing costs |  |  |  |  |  |  |  |  |  |  | $ 10
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  | $ 350 |  |  |
Regulatory asset, property, plant and equipment |  |  |  |  |  | 257 |  |  |  |  |
Public Utility Commission Of Texas | Houston Electric |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery of deferred costs sought |  |  |  | $ 200 |  |  |  |  |  |  |
Annual revenue increase from lease agreements |  |  |  | $ 57 |  |  |  |  |  |  |
Public Utility Commission Of Texas | Houston Electric | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount | $ 39 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 161 |  |  | 202 |  |
Regulatory liability, amount remaining under prudence review |  |  |  |  |  | $ 75 |  |  |  |  |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash Proceeds Received From Government Grants |  | $ 1,100 |  |  |  |  |  |  |  |  |
February 2021 Winter Storm Event | CERC |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets current |  |  |  |  |  |  |  |  | 1,175 |  |
Regulatory assets noncurrent |  |  |  |  |  |  |  |  | $ 202 |  |

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