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Related Party Transactions (Schedule of Capital Contributions) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Union Electric Company |  |  |
Related Party Transaction [Line Items] |  |  |
Capital contribution from parent | $ 0 | $ 207 | $ 491
Ameren Illinois Company |  |  |
Related Party Transaction [Line Items] |  |  |
Capital contribution from parent | $ 15 | $ 262 | $ 464

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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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