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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Income Taxes [Line Items] |  |
Plant-related | $ 4,940 | $ 4,646
Regulatory assets and liabilities, net | (385) | (413)
Deferred employee benefit costs - asset | 27 |
Deferred employee benefit costs - liability |  | 26
Tax carryforwards | (503) | (218)
Other - liabilities | 162 | 161
Total net accumulated deferred income tax liabilities (assets) | 4,241 | 4,150
Accumulated deferred investment tax credits | 233 | 26
Accumulated deferred income taxes and investment tax credits | 4,474 | 4,176
Ameren Missouri |  |
Income Taxes [Line Items] |  |
Plant-related | 2,429 | 2,370
Regulatory assets and liabilities, net | (193) | (206)
Deferred employee benefit costs - liability | 25 | 48
Tax carryforwards | (355) | (124)
Other - liabilities | 131 | 104
Total net accumulated deferred income tax liabilities (assets) | 1,987 | 2,096
Accumulated deferred investment tax credits | 230 | 26
Accumulated deferred income taxes and investment tax credits | 2,217 | 2,122
Ameren Illinois |  |
Income Taxes [Line Items] |  |
Plant-related | 2,250 | 2,030
Regulatory assets and liabilities, net | (170) | (184)
Deferred employee benefit costs - asset | 77 | 55
Tax carryforwards | (45) | (33)
Other - liabilities | 28 | 38
Total net accumulated deferred income tax liabilities (assets) | 2,140 | 1,906
Accumulated deferred investment tax credits | 3 | 0
Accumulated deferred income taxes and investment tax credits | 2,143 | 1,906
Other |  |
Income Taxes [Line Items] |  |
Plant-related | 261 | 246
Regulatory assets and liabilities, net | (22) | (23)
Deferred employee benefit costs - liability | 25 | 33
Tax carryforwards | (103) | (61)
Other - liabilities | 3 | 19
Total net accumulated deferred income tax liabilities (assets) | 114 | 148
Accumulated deferred investment tax credits | 0 | 0
Accumulated deferred income taxes and investment tax credits | $ 114 | $ 148

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- Definition The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-27 + Details
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