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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023, 2022, and 2021:
| Ameren Missouri |  | Ameren Illinois |  | Ameren |
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) |  |  | — |  |  | — |  |
Production 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) |  |  | — |  |  | — |  |
Production and other tax credits(b) | (10) |  |  | — |  |  | (4) |  |
State tax | 3 |  |  | 7 |  |  | 5 |  |
Effective income tax rate | (2) | % |  | 26 | % |  | 14 | % |
2021 |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |
Amortization of excess deferred income taxes(a) | (15) |  |  | (3) |  |  | (8) |  |
Amortization of deferred investment tax credit | (1) |  |  | — |  |  | — |  |
Production and other tax credits(b) | (7) |  |  | — |  |  | (3) |  |
State tax | 3 |  |  | 7 |  |  | 5 |  |
Stock-based compensation | — |  |  | — |  |  | (1) |  |
Effective income tax rate | 1 | % |  | 25 | % |  | 14 | % |
(a)Reflects the amortization of amounts resulting from the revaluation of deferred income taxes subject to regulatory ratemaking, which are being refunded to customers. Deferred income taxes are revalued when federal or state income tax rates change, and the offset to the revaluation of deferred income taxes subject to regulatory ratemaking is recorded to a regulatory asset or liability. (b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM.
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, 2023, 2022, and 2021:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
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 |
2021 |  |  |  |  |  |  |
Current taxes: |  |  |  |  |  |  |
Federal | $ | — |  |  | $ | (15) |  |  | $ | 22 |  |  | $ | 7 |
State | — |  |  | (7) |  |  | 1 |  |  | (6) |
Deferred taxes: |  |  |  |  |  |  |
Federal | 65 |  |  | 120 |  |  | (15) |  |  | 170 |
State | 23 |  |  | 59 |  |  | 4 |  |  | 86 |
Amortization of excess deferred income taxes | (81) |  |  | (14) |  |  | (1) |  |  | (96) |
Amortization of deferred investment tax credits | (4) |  |  | — |  |  | — |  |  | (4) |
Total income tax expense | $ | 3 |  |  | $ | 143 |  |  | $ | 11 |  |  | $ | 157 |
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 investment tax credits at December 31, 2023 and 2022:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
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 |
2022 |  |  |  |  |  |  |
Accumulated deferred income taxes, net liability (asset): |  |  |  |  |  |  |
Plant-related | $ | 2,297 |  |  | $ | 1,880 |  |  | $ | 239 |  |  | $ | 4,416 |
Regulatory assets and liabilities, net | (233) |  |  | (193) |  |  | (23) |  |  | (449) |
Deferred employee benefit costs | (55) |  |  | 28 |  |  | (43) |  |  | (70) |
Tax carryforwards | (122) |  |  | (34) |  |  | (72) |  |  | (228) |
Other | 70 |  |  | 18 |  |  | 22 |  |  | 110 |
Total net accumulated deferred income tax liabilities (assets) | 1,957 |  |  | 1,699 |  |  | 123 |  |  | 3,779 |
Accumulated deferred investment tax credits | 25 |  |  | — |  |  | — |  |  | 25 |
Accumulated deferred income taxes and investment tax credits | $ | 1,982 |  |  | $ | 1,699 |  |  | $ | 123 |  |  | $ | 3,804 |
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, 2023 and 2022:
| Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
2023 |  |  |  |  |  |  |
Net operating loss carryforwards: |  |  |  |  |  |  |
State(a) | $ | — |  |  | $ | 26 |  |  | $ | 16 |  |  | $ | 42 |
Total net operating loss carryforwards | $ | — |  |  | $ | 26 |  |  | $ | 16 |  |  | $ | 42 |
Tax credit carryforwards: |  |  |  |  |  |  |
Federal(b) | $ | 124 |  |  | $ | 5 |  |  | $ | 45 |  |  | $ | 174 |
State(c) | — |  |  | 2 |  |  | — |  |  | 2 |
Total tax credit carryforwards | $ | 124 |  |  | $ | 7 |  |  | $ | 45 |  |  | $ | 176 |
2022 |  |  |  |  |  |  |
Net operating loss carryforwards: |  |  |  |  |  |  |
Federal | $ | 3 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 11 |
State | 1 |  |  | 26 |  |  | 9 |  |  | 36 |
Total net operating loss carryforwards | $ | 4 |  |  | $ | 30 |  |  | $ | 13 |  |  | $ | 47 |
Tax credit carryforwards: |  |  |  |  |  |  |
Federal | $ | 118 |  |  | $ | 3 |  |  | $ | 55 |  |  | $ | 176 |
State | — |  |  | 1 |  |  | 4 |  |  | 5 |
Total tax credit carryforwards | $ | 118 |  |  | $ | 4 |  |  | $ | 59 |  |  | $ | 181 |
(a)Will expire between 2032 and 2043. (b)Will expire between 2030 and 2043. (c)Will expire between 2025 and 2028.

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