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Rate and Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) | Jun. 30, 2022 MWh | Mar. 31, 2022 MWh | Dec. 31, 2022 USD ($) MWh numberOfCountriesInvestigatedByTheDOC | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 16, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Minimum Tax on Book Income, Inflation Reduction Act, Percent |  |  |  |  |  |  | 15.00%
Revenues |  |  |  | $ 7,957 | $ 6,394 | $ 5,794 |
Depreciation and amortization |  |  |  | 1,289 | 1,146 | 1,075 |
Other operations and maintenance |  |  |  | $ 1,937 | 1,774 | 1,661 |
Union Electric Company |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount of Megawatts | MWh |  |  |  | 102 |  |  |
Missouri Renewable Energy Standard Percentage |  |  |  | 15.00% |  |  |
Missouri Renewable Energy Standard Percentage - Solar |  |  |  | 2.00% |  |  |
Number of Countries Investigated by the DOC | numberOfCountriesInvestigatedByTheDOC |  |  |  | 4 |  |  |
Depreciation and amortization |  |  |  | $ 732 | 632 | 604 |
Other operations and maintenance |  |  |  | $ 1,028 | 948 | 886 |
Union Electric Company | Wind Generation Facility |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount of Megawatts | MWh |  | 200 | 150 |  |  |  |
Union Electric Company | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
PISA Rate Increase Limit Beginning 2024 |  |  |  | 2.50% |  |  |
Percentage of energy sourced from renewable resources |  |  |  | 100.00% |  |  |
Union Electric Company | Electric | Pending Rate Case |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  | $ 316 |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  | 10.20% |  |  |
Public Utilities, Requested Equity Capital Structure, Percentage |  |  |  | 51.93% |  |  |
Rate Base |  |  |  | $ 11,600 |  |  |
Months to complete a rate proceeding |  |  |  | 11 months |  |  |
Union Electric Company | Electric | Final Rate Order |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Rate Base |  |  |  |  | 10,200 |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  | $ 220 |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  | 51.97% |  |
Depreciation and amortization |  |  |  |  | $ 140 |  |
Other operations and maintenance |  |  |  |  | 40 |  |
Union Electric Company | Electric | Subsequent Event | Pending Rate Case |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
MoPSC Staff recommended rate increase (decrease) | $ 199 |  |  |  |  |  |
MoPSC Staff's recommended ROE | 9.59% |  |  |  |  |  |
MoPSC Staff's recommended capital structure | 51.84% |  |  |  |  |  |
MoPSC Staff's recommended rate base | $ 10,500 |  |  |  |  |  |
MoPSC Staff's recommended true-up adjustments | $ 128 |  |  |  |  |  |
Percentage of High Prairie costs challenged by the MoOPC | 29.00% |  |  |  |  |  |
Union Electric Company | Natural gas | Final Rate Order |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Rate Base |  |  |  | $ 313 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  | 5 |  |
Union Electric Company | MEEIA 2019 [Domain] | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | $ 22 |  |  |
Union Electric Company | MEEIA 2019 [Domain] | Electric | Final Rate Order |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 9 | $ 6 |

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