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Callaway Energy Center (Fair Values Of Investments In Debt And Equity Securities In Nuclear Decommissioning Trust Fund) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Nuclear Waste Matters [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 374 |  |  |
Total cash, cash equivalents, and restricted cash | 216 | $ 155 | $ 301 | $ 176
Fair Value | 958 | 1,159 |  |
Cash and cash equivalents | 10 | 8 |  |
Union Electric Company |  |  |  |
Nuclear Waste Matters [Line Items] |  |  |  |
Debt, Equity, Marketable, And Other Securities, Available-For-Sale, Amortized Cost | 562 | 515 |  |
Total cash, cash equivalents, and restricted cash | 13 | 8 | $ 145 | $ 39
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 455 | 650 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 59 | 6 |  |
Fair Value | 958 | 1,159 |  |
Cash and cash equivalents | 0 | 0 |  |
Debt, Equity, Marketable, And Other Securities, Available-For-Sale | 958 | 1,159 |  |
Union Electric Company | Debt securities |  |  |  |
Nuclear Waste Matters [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 374 | 320 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 10 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 45 | 2 |  |
Fair Value | 329 | 328 |  |
Union Electric Company | Equity securities |  |  |  |
Nuclear Waste Matters [Line Items] |  |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 177 | 188 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 455 | 640 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 14 | 4 |  |
Equity Securities, FV-NI | 618 | 824 |  |
Union Electric Company | Cash and cash equivalents |  |  |  |
Nuclear Waste Matters [Line Items] |  |  |  |
Marketable Securities | 8 | 4 |  |
Total cash, cash equivalents, and restricted cash | 0 | 0 |  |
Cash and Cash Equivalents and Restricted Cash and Cash Equivalents | 0 | 0 |  |
Cash and cash equivalents | 8 | 4 |  |
Union Electric Company | Other Debt And Equity Securities |  |  |  |
Nuclear Waste Matters [Line Items] |  |  |  |
Net Receivables (Payables) From Pending Securities Sales, Interest, and Securities Purchases, Cost Basis | 3 | 3 |  |
Net Receivables (Payables) From Pending Securities Sales, Interest, And Securities Purchases, Available-For-sale Securities, Accumulated Gross Unrealized Gain, Before Tax | 0 | 0 |  |
Net Receivables (Payables) From Pending Securities Sales, Interest, And Securities Purchases, Available-For-sale Securities, Accumulated Gross Unrealized Loss, Before Tax | 0 | 0 |  |
Net Receivables (Payables) From Pending Securities Sales, Interest, and Securities Purchases, Fair Value | $ 3 | $ 3 |  |

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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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