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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | $ 901 | $ 1,152
Assets fair value | 1,068 | 1,242
Excluded receivables, payables, and accrued income, net | 9 | 7
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 574 | 824
Assets fair value | 603 | 848
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 327 | 328
Assets fair value | 418 | 373
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 47 | 21
Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 167 | 90
Derivative Liability | 177 | 202
Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 29 | 24
Derivative Liability | 99 | 45
Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 91 | 45
Derivative Liability | 8 | 7
Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 47 | 21
Derivative Liability | 70 | 150
Union Electric Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 901 | 1,152
Assets fair value | 974 | 1,201
Union Electric Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 574 | 824
Assets fair value | 597 | 847
Union Electric Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 327 | 328
Assets fair value | 353 | 340
Union Electric Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 0 | 0
Assets fair value | 24 | 14
Union Electric Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 73 | 49
Derivative Liability | 129 | 77
Union Electric Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 23 | 23
Derivative Liability | 99 | 45
Union Electric Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 26 | 12
Derivative Liability | 2 | 2
Union Electric Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 24 | 14
Derivative Liability | 28 | 30
Union Electric Company | Fuel oils | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 15 | 13
Derivative Liability | 1 | 0
Union Electric Company | Fuel oils | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 13 | 13
Derivative Liability | 1 | 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 | 2 | 0
Derivative Liability | 0 | 0
Union Electric Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 27 | 12
Derivative Liability | 3 | 3
Union Electric Company | Natural gas | Commodity Contract | Level 1 |  |
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 | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 26 | 12
Derivative Liability | 2 | 2
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 | 1
Union Electric Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 28 | 23
Derivative Liability | 125 | 73
Union Electric Company | Power | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 9 | 10
Derivative Liability | 98 | 45
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 | 19 | 13
Derivative Liability | 27 | 28
Union Electric Company | Uranium | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 3 | 1
Derivative Liability | 0 | 1
Union Electric Company | Uranium | 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 | Uranium | 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 | Uranium | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 3 | 1
Derivative Liability | 0 | 1
Union Electric Company | Equity securities: | U.S. large capitalization |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Nuclear decommissioning trust fund: | 574 | 824
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: | 574 | 824
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: | 148 | 141
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: | 148 | 141
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: | 115 | 131
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: | 115 | 131
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: | 64 | 56
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: | 64 | 56
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 | 94 | 41
Ameren Illinois Company | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 6 | 1
Ameren Illinois Company | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 65 | 33
Ameren Illinois Company | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets fair value | 23 | 7
Ameren Illinois Company | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 48 | 125
Ameren Illinois Company | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 0 | 0
Ameren Illinois Company | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 6 | 5
Ameren Illinois Company | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Liability | 42 | 120
Ameren Illinois Company | Natural gas | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 78 | 41
Derivative Liability | 12 | 8
Ameren Illinois Company | Natural gas | Commodity Contract | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 1
Derivative Liability | 0 | 0
Ameren Illinois Company | Natural gas | Commodity Contract | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 65 | 33
Derivative Liability | 6 | 5
Ameren Illinois Company | Natural gas | Commodity Contract | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 | 7
Derivative Liability | 6 | 3
Ameren Illinois Company | Power | Commodity Contract |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 16 | 0
Derivative Liability | 36 | 117
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 | 16 | 0
Derivative Liability | $ 36 | $ 117

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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