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Income Taxes (Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Net operating loss carryforwards: |  |
Net operating loss carryforwards: | $ 42 | $ 47
Tax credit carryforwards: | 176 | 181
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: |  | 11
Tax credit carryforwards: | 174 | 176
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 42 | 36
Tax credit carryforwards: | 2 | 5
Ameren Missouri |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 4
Tax credit carryforwards: | 124 | 118
Ameren Missouri | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: |  | 3
Tax credit carryforwards: | 124 | 118
Ameren Missouri | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 1
Tax credit carryforwards: | 0 | 0
Ameren Illinois |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 26 | 30
Tax credit carryforwards: | 7 | 4
Ameren Illinois | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: |  | 4
Tax credit carryforwards: | 5 | 3
Ameren Illinois | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 26 | 26
Tax credit carryforwards: | 2 | 1
Other |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 16 | 13
Tax credit carryforwards: | 45 | 59
Other | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: |  | 4
Tax credit carryforwards: | 45 | 55
Other | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 16 | 9
Tax credit carryforwards: | $ 0 | $ 4

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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