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Fair Value Measurements (Schedule Of Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | $ 1,256 | $ 1,141
Assets fair value | 1,280 | 1,163
Excluded receivables, payables, and accrued income, net | 10 | 9
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 842 | 787
Assets fair value | 843 | 789
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 414 | 354
Assets fair value | 418 | 358
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 19 | 16
Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 24 | 22
Derivative Liability | 141 | 168
Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 1 | 2
Derivative Liability | 3 | 6
Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 4 | 4
Derivative Liability | 68 | 79
Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 19 | 16
Derivative Liability | 70 | 83
Union Electric Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 1,256 | 1,141
Assets fair value | 1,276 | 1,160
Union Electric Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 842 | 787
Assets fair value | 843 | 789
Union Electric Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 414 | 354
Assets fair value | 417 | 357
Union Electric Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 16 | 14
Union Electric Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 20 | 19
Derivative Liability | 19 | 25
Union Electric Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 1 | 2
Derivative Liability | 1 | 2
Union Electric Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 3 | 3
Derivative Liability | 16 | 19
Union Electric Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 16 | 14
Derivative Liability | 2 | 4
Union Electric Company | Fuel oils | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 2 | 2
Derivative Liability | 1 | 2
Union Electric Company | Fuel oils | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 1 | 2
Derivative Liability | 1 | 2
Union Electric Company | Fuel oils | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 0 | 0
Union Electric Company | Fuel oils | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 1 | 0
Derivative Liability | 0 | 0
Union Electric Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 3 | 3
Derivative Liability | 17 | 22
Union Electric Company | Natural gas | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 0 | 0
Union Electric Company | Natural gas | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 3 | 3
Derivative Liability | 16 | 19
Union Electric Company | Natural gas | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 1 | 3
Union Electric Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 15 | 5
Derivative Liability | 1 | 1
Union Electric Company | Power | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 0 | 0
Union Electric Company | Power | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 0 | 0
Union Electric Company | Power | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 15 | 5
Derivative Liability | 1 | 1
Union Electric Company | Uranium | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 9
Union Electric Company | Uranium | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Union Electric Company | Uranium | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Union Electric Company | Uranium | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 9
Union Electric Company | Equity securities: | U.S. large capitalization |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 842 | 787
Union Electric Company | Equity securities: | U.S. large capitalization | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 842 | 787
Union Electric Company | Equity securities: | U.S. large capitalization | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Equity securities: | U.S. large capitalization | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | U.S. Treasury and agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 178 | 150
Union Electric Company | Debt securities: | U.S. Treasury and agency securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | U.S. Treasury and agency securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 178 | 150
Union Electric Company | Debt securities: | U.S. Treasury and agency securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 154 | 136
Union Electric Company | Debt securities: | Corporate bonds | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | Corporate bonds | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 154 | 136
Union Electric Company | Debt securities: | Corporate bonds | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | Other Debt Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 82 | 68
Union Electric Company | Debt securities: | Other Debt Securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Union Electric Company | Debt securities: | Other Debt Securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 82 | 68
Union Electric Company | Debt securities: | Other Debt Securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Ameren Illinois Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 4 | 3
Ameren Illinois Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 0 | 0
Ameren Illinois Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 1 | 1
Ameren Illinois Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 3 | 2
Ameren Illinois Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 122 | 143
Ameren Illinois Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 2 | 4
Ameren Illinois Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 52 | 60
Ameren Illinois Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 68 | 79
Ameren Illinois Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 4 | 3
Derivative Liability | 61 | 75
Ameren Illinois Company | Natural gas | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liability | 2 | 4
Ameren Illinois Company | Natural gas | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 1 | 1
Derivative Liability | 52 | 60
Ameren Illinois Company | Natural gas | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Assets | 3 | 2
Derivative Liability | 7 | 11
Ameren Illinois Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 61 | 68
Ameren Illinois Company | Power | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 0 | 0
Ameren Illinois Company | Power | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 0 | 0
Ameren Illinois Company | Power | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | $ 61 | $ 68

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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