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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Schedule Of Effective Income Tax Rate Reconciliation | The following table presents the principal reasons for the difference between the effective income tax rate and the federal statutory corporate income tax rate for the years ended December 31, 2024, 2023, and 2022:
| Ameren Missouri |  | Ameren Illinois |  | Ameren |
2024 |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |
Amortization of excess deferred income taxes(a) | (17) |  |  | (4) |  |  | (9) |  |
Amortization of deferred investment tax credit | (1) |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (24) |  |  | — |  |  | (9) |  |
State tax | 3 |  |  | 7 |  |  | 5 |  |
Depreciation differences | — |  |  | — |  |  | (1) |  |
Effective income tax rate | (18) | % |  | 24 | % |  | 7 | % |
2023 |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |
Amortization of excess deferred income taxes(a) | (15) |  |  | (2) |  |  | (8) |  |
Amortization of deferred investment tax credit | (1) |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (10) |  |  | — |  |  | (4) |  |
State tax | 3 |  |  | 7 |  |  | 5 |  |
Effective income tax rate | (2) | % |  | 26 | % |  | 14 | % |
2022 |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |
Amortization of excess deferred income taxes(a) | (15) |  |  | (2) |  |  | (8) |  |
Amortization of deferred investment tax credit | (1) |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (10) |  |  | — |  |  | (4) |  |
State tax | 3 |  |  | 7 |  |  | 5 |  |
Effective income tax rate | (2) | % |  | 26 | % |  | 14 | % |
(a)Reflects the amortization of a regulatory liability resulting from the revaluation of accumulated deferred income taxes subject to regulatory ratemaking, which are being refunded to customers. (b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM. The benefit of the credits associated with the production and investment tax credit tracker will be refunded to customers based on MoPSC approval in a regulatory rate review.
Schedule Of Components Of Income Tax Expense (Benefit) | The following table presents the components of income tax expense (benefit) for the years ended December 31, 2024, 2023, and 2022:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
2024 |  |  |  |  |  |  |
Current taxes: |  |  |  |  |  |  |
Federal | $ | (55) |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | (43) |
State | (3) |  |  | — |  |  | 2 |  |  | (1) |
Deferred taxes: |  |  |  |  |  |  |
Federal | 45 |  |  | 144 |  |  | (12) |  |  | 177 |
State | 8 |  |  | 76 |  |  | (19) |  |  | 65 |
Amortization of excess deferred income taxes | (79) |  |  | (32) |  |  | (1) |  |  | (112) |
Amortization of deferred investment tax credits | (3) |  |  | — |  |  | — |  |  | (3) |
Total income tax expense (benefit) | $ | (87) |  |  | $ | 193 |  |  | $ | (23) |  |  | $ | 83 |
2023 |  |  |  |  |  |  |
Current taxes: |  |  |  |  |  |  |
Federal | $ | (37) |  |  | $ | 27 |  |  | $ | (37) |  |  | $ | (47) |
State | 1 |  |  | 5 |  |  | (5) |  |  | 1 |
Deferred taxes: |  |  |  |  |  |  |
Federal | 102 |  |  | 123 |  |  | 35 |  |  | 260 |
State | 9 |  |  | 71 |  |  | (10) |  |  | 70 |
Amortization of excess deferred income taxes | (80) |  |  | (17) |  |  | (1) |  |  | (98) |
Amortization of deferred investment tax credits | (3) |  |  | — |  |  | — |  |  | (3) |
Total income tax expense (benefit) | $ | (8) |  |  | $ | 209 |  |  | $ | (18) |  |  | $ | 183 |
2022 |  |  |  |  |  |  |
Current taxes: |  |  |  |  |  |  |
Federal | $ | (26) |  |  | $ | 46 |  |  | $ | (15) |  |  | $ | 5 |
State | (5) |  |  | 16 |  |  | (10) |  |  | 1 |
Deferred taxes: |  |  |  |  |  |  |
Federal | 93 |  |  | 82 |  |  | 19 |  |  | 194 |
State | 18 |  |  | 48 |  |  | 14 |  |  | 80 |
Amortization of excess deferred income taxes | (86) |  |  | (13) |  |  | (1) |  |  | (100) |
Amortization of deferred investment tax credits | (4) |  |  | — |  |  | — |  |  | (4) |
Total income tax expense (benefit) | $ | (10) |  |  | $ | 179 |  |  | $ | 7 |  |  | $ | 176 |
Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences | The following table presents the accumulated deferred income tax assets and liabilities recorded as a result of temporary differences and accumulated deferred production and investment tax credits at December 31, 2024 and 2023:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
2024 |  |  |  |  |  |  |
Accumulated deferred income taxes, net liability (asset): |  |  |  |  |  |  |
Plant-related | $ | 2,429 |  |  | $ | 2,250 |  |  | $ | 261 |  |  | $ | 4,940 |
Regulatory assets and liabilities, net | (193) |  |  | (170) |  |  | (22) |  |  | (385) |
Deferred employee benefit costs | (25) |  |  | 77 |  |  | (25) |  |  | 27 |
Tax carryforwards | (355) |  |  | (45) |  |  | (103) |  |  | (503) |
Other | 131 |  |  | 28 |  |  | 3 |  |  | 162 |
Total net accumulated deferred income tax liabilities (assets) | 1,987 |  |  | 2,140 |  |  | 114 |  |  | 4,241 |
Accumulated deferred investment tax credits | 230 |  |  | 3 |  |  | — |  |  | 233 |
Accumulated deferred income taxes and investment tax credits | $ | 2,217 |  |  | $ | 2,143 |  |  | $ | 114 |  |  | $ | 4,474 |
2023 |  |  |  |  |  |  |
Accumulated deferred income taxes, net liability (asset): |  |  |  |  |  |  |
Plant-related | $ | 2,370 |  |  | $ | 2,030 |  |  | $ | 246 |  |  | $ | 4,646 |
Regulatory assets and liabilities, net | (206) |  |  | (184) |  |  | (23) |  |  | (413) |
Deferred employee benefit costs | (48) |  |  | 55 |  |  | (33) |  |  | (26) |
Tax carryforwards | (124) |  |  | (33) |  |  | (61) |  |  | (218) |
Other | 104 |  |  | 38 |  |  | 19 |  |  | 161 |
Total net accumulated deferred income tax liabilities (assets) | 2,096 |  |  | 1,906 |  |  | 148 |  |  | 4,150 |
Accumulated deferred investment tax credits | 26 |  |  | — |  |  | — |  |  | 26 |
Accumulated deferred income taxes and investment tax credits | $ | 2,122 |  |  | $ | 1,906 |  |  | $ | 148 |  |  | $ | 4,176 |
Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards | The following table presents the components of accumulated deferred income tax assets relating to net operating loss carryforwards and tax credit carryforwards at December 31, 2024 and 2023:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
2024 |  |  |  |  |  |  |
Net operating loss carryforwards: |  |  |  |  |  |  |
Federal(a) | $ | — |  |  | $ | — |  |  | $ | 30 |  |  | $ | 30 |
State(b) | — |  |  | 34 |  |  | 29 |  |  | 63 |
Total net operating loss carryforwards | $ | — |  |  | $ | 34 |  |  | $ | 59 |  |  | $ | 93 |
Tax credit carryforwards: |  |  |  |  |  |  |
Federal(c) | $ | 355 |  |  | $ | 9 |  |  | $ | 44 |  |  | $ | 408 |
State(d) | — |  |  | 2 |  |  | — |  |  | 2 |
Total tax credit carryforwards | $ | 355 |  |  | $ | 11 |  |  | $ | 44 |  |  | $ | 410 |
2023 |  |  |  |  |  |  |
Net operating loss carryforwards: |  |  |  |  |  |  |
Federal | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
State | — |  |  | 26 |  |  | 16 |  |  | 42 |
Total net operating loss carryforwards | $ | — |  |  | $ | 26 |  |  | $ | 16 |  |  | $ | 42 |
Tax credit carryforwards: |  |  |  |  |  |  |
Federal | $ | 124 |  |  | $ | 5 |  |  | $ | 45 |  |  | $ | 174 |
State | — |  |  | 2 |  |  | — |  |  | 2 |
Total tax credit carryforwards | $ | 124 |  |  | $ | 7 |  |  | $ | 45 |  |  | $ | 176 |
(a)No expiration date. (b)Will expire between 2032 and 2044. (c)Will expire between 2031 and 2044. (d)Will expire between 2025 and 2028.

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