Amount of megawatts

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- Definition

Cass County Solar Project Purchase Price

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- Definition

Energy efficiency investments in MEEIA 2019 programs

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MEEIA performance incentive awards if energy efficiency goals are achieved.

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MEEIA performance incentive awards earned if energy efficiency goals are exceeded.

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- Definition

MoPSC Approved Costs to be Securitized

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Months to complete a rate proceeding

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- Definition

Percentage of MEEIA Energy Efficiency Goals Achieved

+ References

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Rate And Regulatory Matters [Line Items]

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Value established for a utility on which the entity is allowed to earn a particular rate of return

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- Definition

Requested Costs to be Securitized

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

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Percentage of public utility's requested equity to capital, including debt and equity.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions	1 Months Ended	3 Months Ended					6 Months Ended		12 Months Ended
	Nov. 30, 2023 USD ($)	Jun. 30, 2024 MWh	Sep. 30, 2023 MWh	Dec. 31, 2022 MWh	Sep. 30, 2022 MWh	Jun. 30, 2022 MWh	Jun. 30, 2024 USD ($) MWh	Jun. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)
Rate And Regulatory Matters [Line Items]
Capital expenditures							$ 1,892	$ 1,822
Union Electric Company
Rate And Regulatory Matters [Line Items]
Capital expenditures							1,104	$ 914
Cass County Solar Project Purchase Price							250
Union Electric Company \| Rush Island Energy Center
Rate And Regulatory Matters [Line Items]
MoPSC Approved Costs to be Securitized							$ 470
Requested Costs to be Securitized	$ 519
Regulatory Asset, Amortization Period	15 years
Union Electric Company \| Solar generation facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh							500
Capital expenditures							$ 850
Union Electric Company \| Electric \| Pending Rate Case
Rate And Regulatory Matters [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 446
Public Utilities, Requested Return on Equity, Percentage							10.25%
Public Utilities, Requested Equity Capital Structure, Percentage							52.00%
Rate Base							$ 14,000
Months to complete a rate proceeding							11 months
Union Electric Company \| Electric \| MEEIA 2024 \| Forecast
Rate And Regulatory Matters [Line Items]
Energy efficiency investments in MEEIA 2019 programs									$ 123
Percentage of MEEIA Energy Efficiency Goals Achieved									100.00%
Incentive award if energy efficiency goals are achieved									$ 56
Incentive award if energy efficiency goals are exceeded									$ 14
Union Electric Company \| Build-transfer \| Solar generation facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh			300		200	150
Union Electric Company \| Development-transfer \| Solar generation facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh			150
Union Electric Company \| Self-build \| Solar generation facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh			50	50
Union Electric Company \| Self-build \| Natural Gas Generation Facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh		800