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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, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | $ 1,069 | $ 947
Assets fair value | 1,112 | 1,036
Excluded receivables, payables, and accrued income, net | 6 | 11
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 727 | 618
Assets fair value | 733 | 636
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 342 | 329
Assets fair value | 358 | 372
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 21 | 28
Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 43 | 89
Derivative Liability | 145 | 136
Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 18
Derivative Liability | 15 | 57
Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 16 | 43
Derivative Liability | 51 | 25
Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 21 | 28
Derivative Liability | 79 | 54
Union Electric Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 1,069 | 947
Assets fair value | 1,099 | 996
Union Electric Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 727 | 618
Assets fair value | 733 | 635
Union Electric Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 342 | 329
Assets fair value | 349 | 344
Union Electric Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 17 | 17
Union Electric Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 30 | 49
Derivative Liability | 31 | 68
Union Electric Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 17
Derivative Liability | 14 | 57
Union Electric Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 | 15
Derivative Liability | 13 | 6
Union Electric Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 17 | 17
Derivative Liability | 4 | 5
Union Electric Company | Fuel oils | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 16
Derivative Liability | 2 | 0
Union Electric Company | Fuel oils | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 16
Derivative Liability | 2 | 0
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 | 0 | 0
Derivative Liability | 0 | 0
Union Electric Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 | 16
Derivative Liability | 16 | 9
Union Electric Company | Natural gas | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 1
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 | 7 | 15
Derivative Liability | 13 | 6
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 | 3 | 3
Union Electric Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 15 | 14
Derivative Liability | 13 | 59
Union Electric Company | Power | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Derivative Liability | 12 | 57
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 | 14
Derivative Liability | 1 | 2
Union Electric Company | Uranium | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 2 | 3
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 | 2 | 3
Union Electric Company | Equity securities: | U.S. large capitalization |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 727 | 618
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: | 727 | 618
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: | 147 | 137
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: | 147 | 137
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: | 126 | 122
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: | 126 | 122
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: | 69 | 70
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: | 69 | 70
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 | 13 | 40
Ameren Illinois Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 0 | 1
Ameren Illinois Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 9 | 28
Ameren Illinois Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 4 | 11
Ameren Illinois Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 114 | 68
Ameren Illinois Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 1 | 0
Ameren Illinois Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 38 | 19
Ameren Illinois Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 75 | 49
Ameren Illinois Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 13 | 34
Derivative Liability | 46 | 29
Ameren Illinois Company | Natural gas | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 1
Derivative Liability | 1 | 0
Ameren Illinois Company | Natural gas | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 9 | 28
Derivative Liability | 38 | 19
Ameren Illinois Company | Natural gas | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 4 | 5
Derivative Liability | 7 | 10
Ameren Illinois Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 6
Derivative Liability | 68 | 39
Ameren Illinois Company | Power | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Derivative Liability | 0 | 0
Ameren Illinois Company | Power | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Derivative Liability | 0 | 0
Ameren Illinois Company | Power | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 6
Derivative Liability | $ 68 | $ 39

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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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