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Fair Value Measurements (Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level Three In The Fair Value Hierarchy) (Details) - Power - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ (54) | $ (80) | $ (21) | $ (132)
Included in regulatory assets/liabilities | (4) | 20 | (37) | 49
Settlements, assets |  | 32 |  | 55
Settlement, liabilities | 0 |  | 0 |
Change in unrealized gains (losses) related to assets/liabilities held at period end | (4) | 25 | (25) | 61
Ending balance | (58) | (28) | (58) | (28)
Union Electric Company |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 14 | (36) | 12 | (15)
Included in regulatory assets/liabilities | (5) | (10) | 3 | (56)
Settlements, assets |  | 38 |  | 63
Settlement, liabilities | (3) |  | (9) |
Change in unrealized gains (losses) related to assets/liabilities held at period end | (5) | (3) | 6 | (39)
Ending balance | 6 | (8) | 6 | (8)
Ameren Illinois Company |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | (68) | (44) | (33) | (117)
Included in regulatory assets/liabilities | 1 | 30 | (40) | 105
Settlements, assets | 3 |  | 9 |
Settlement, liabilities |  | (6) |  | (8)
Change in unrealized gains (losses) related to assets/liabilities held at period end | 1 | 28 | (31) | 100
Ending balance | $ (64) | $ (20) | $ (64) | $ (20)

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- Definition This element represents the change in unrealized gains (losses) related to assets and liabilities measured at fair value using significant unobservable inputs (Level 3) still held as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | aee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets or regulatory liabilities. + References No definition available. + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Details
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