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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Schedule Of Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value On Recurring Basis | The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value on a recurring basis as of September 30, 2024, and December 31, 2023:
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | Level 1 | Level 2 | Level 3 | Total |  |  | Level 1 | Level 2 | Level 3 | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |
Ameren Missouri |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Fuel oils | $ | — |  | $ | — |  | $ | — |  | $ | — |  |  |  | $ | 2 |  | $ | — |  | $ | — |  | $ | 2 |  |
| Natural gas | — |  | 3 |  | — |  | 3 |  |  |  | — |  | 3 |  | — |  | 3 |  |
| Power | — |  | — |  | 10 |  | 10 |  |  |  | — |  | — |  | 5 |  | 5 |  |
| Uranium | — |  | — |  | — |  | — |  |  |  | — |  | — |  | 9 |  | 9 |  |
| Total derivative assets – commodity contracts | $ | — |  | $ | 3 |  | $ | 10 |  | $ | 13 |  |  |  | $ | 2 |  | $ | 3 |  | $ | 14 |  | $ | 19 |  |
| Nuclear decommissioning trust fund: |  |  |  |  |  |  |  |  |  |  |
| Equity securities: |  |  |  |  |  |  |  |  |  |  |
| U.S. large capitalization | $ | 888 |  | $ | — |  | $ | — |  | $ | 888 |  |  |  | $ | 787 |  | $ | — |  | $ | — |  | $ | 787 |  |
| Debt securities: |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and agency securities | — |  | 212 |  | — |  | 212 |  |  |  | — |  | 150 |  | — |  | 150 |  |
| Corporate bonds | — |  | 147 |  | — |  | 147 |  |  |  | — |  | 136 |  | — |  | 136 |  |
| Other | — |  | 78 |  | — |  | 78 |  |  |  | — |  | 68 |  | — |  | 68 |  |
| Total nuclear decommissioning trust fund | $ | 888 |  | $ | 437 |  | $ | — |  | $ | 1,325 |  | (a) |  | $ | 787 |  | $ | 354 |  | $ | — |  | $ | 1,141 |  | (a)
| Total Ameren Missouri | $ | 888 |  | $ | 440 |  | $ | 10 |  | $ | 1,338 |  |  |  | $ | 789 |  | $ | 357 |  | $ | 14 |  | $ | 1,160 |  |
Ameren Illinois |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Natural gas | $ | 1 |  | $ | 1 |  | $ | 1 |  | $ | 3 |  |  |  | $ | — |  | $ | 1 |  | $ | 2 |  | $ | 3 |  |
| Total Ameren Illinois | $ | 1 |  | $ | 1 |  | $ | 1 |  | $ | 3 |  |  |  | $ | — |  | $ | 1 |  | $ | 2 |  | $ | 3 |  |
Ameren |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts(b) | $ | 1 |  | $ | 4 |  | $ | 11 |  | $ | 16 |  |  |  | $ | 2 |  | $ | 4 |  | $ | 16 |  | $ | 22 |  |
| Nuclear decommissioning trust fund(c) | 888 |  | 437 |  | — |  | 1,325 |  | (a) |  | 787 |  | 354 |  | — |  | 1,141 |  | (a)
| Total Ameren | $ | 889 |  | $ | 441 |  | $ | 11 |  | $ | 1,341 |  |  |  | $ | 789 |  | $ | 358 |  | $ | 16 |  | $ | 1,163 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Ameren Missouri |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Fuel oils | $ | 4 |  | $ | — |  | $ | 1 |  | $ | 5 |  |  |  | $ | 2 |  | $ | — |  | $ | — |  | $ | 2 |  |
| Natural gas | — |  | 15 |  | 1 |  | 16 |  |  |  | — |  | 19 |  | 3 |  | 22 |  |
| Power | — |  | — |  | — |  | — |  |  |  | — |  | — |  | 1 |  | 1 |  |
| Total Ameren Missouri | $ | 4 |  | $ | 15 |  | $ | 2 |  | $ | 21 |  |  |  | $ | 2 |  | $ | 19 |  | $ | 4 |  | $ | 25 |  |
Ameren Illinois |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Natural gas | $ | 3 |  | $ | 48 |  | $ | 6 |  | $ | 57 |  |  |  | $ | 4 |  | $ | 60 |  | $ | 11 |  | $ | 75 |  |
| Power | — |  | — |  | 78 |  | 78 |  |  |  | — |  | — |  | 68 |  | 68 |  |
| Total Ameren Illinois | $ | 3 |  | $ | 48 |  | $ | 84 |  | $ | 135 |  |  |  | $ | 4 |  | $ | 60 |  | $ | 79 |  | $ | 143 |  |
Ameren |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts(b) | $ | 7 |  | $ | 63 |  | $ | 86 |  | $ | 156 |  |  |  | $ | 6 |  | $ | 79 |  | $ | 83 |  | $ | 168 |  |
(a)Balance excludes $8 million and $9 million of cash and cash equivalents, receivables, payables, and accrued income, net, for September 30, 2024, and December 31, 2023, respectively. (b)See the Ameren Missouri and Ameren Illinois sections of the table for a breakout of the fair value of Ameren’s derivative assets and liabilities by type of commodity. (c)See the Ameren Missouri section of the table for a breakout of the fair value of Ameren’s nuclear decommissioning trust fund by investment type.
Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level Three In The Fair Value Hierarchy | The following table presents the fair value reconciliation of Level 3 power derivative contract assets and liabilities measured at fair value on a recurring basis for the three and nine months ended September 30, 2024 and 2023:
| 2024 |  |  | 2023
| Ameren Missouri | Ameren Illinois |  |  | Ameren |  |  | Ameren Missouri | Ameren Illinois | Ameren
For the three months ended September 30: |  |  |  |  |  |  |  |  |  |
Beginning balance at July 1 | $ | 14 |  | $ | (61) |  |  |  | $ | (47) |  |  |  | $ | 14 |  | $ | (68) |  | $ | (54) |
Realized and unrealized gains/(losses) included in regulatory assets/liabilities | (1) |  | (21) |  |  |  | (22) |  |  |  | (5) |  | 1 |  | (4) |
Settlements | (3) |  | 4 |  |  |  | 1 |  |  |  | (3) |  | 3 |  | — |
Ending balance at September 30 | $ | 10 |  | $ | (78) |  |  |  | $ | (68) |  |  |  | $ | 6 |  | $ | (64) |  | $ | (58) |
Change in unrealized gains/(losses) related to assets/liabilities held at September 30 | $ | (1) |  | $ | (19) |  |  |  | $ | (20) |  |  |  | $ | (5) |  | $ | 1 |  | $ | (4) |
For the nine months ended September 30: |  |  |  |  |  |  |  |  |  |
Beginning balance at January 1 | $ | 4 |  | $ | (68) |  |  |  | $ | (64) |  |  |  | $ | 12 |  | $ | (33) |  | $ | (21) |
Realized and unrealized gains/(losses) included in regulatory assets/liabilities | 13 |  | (23) |  |  |  | (10) |  |  |  | 3 |  | (40) |  | (37) |
Settlements | (7) |  | 13 |  |  |  | 6 |  |  |  | (9) |  | 9 |  | — |
Ending balance at September 30 | $ | 10 |  | $ | (78) |  |  |  | $ | (68) |  |  |  | $ | 6 |  | $ | (64) |  | $ | (58) |
Change in unrealized gains/(losses) related to assets/liabilities held at September 30 | $ | 10 |  | $ | (18) |  |  |  | $ | (8) |  |  |  | $ | 6 |  | $ | (31) |  | $ | (25) |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques | The following table describes the valuation techniques and significant unobservable inputs utilized for the fair value of our Level 3 power derivative contract assets and liabilities as of September 30, 2024, and December 31, 2023:
|  |  | Fair Value |  |  |  | Weighted Average(b) |
| Commodity |  | Assets |  | Liabilities | Valuation Technique(s) | Unobservable Input(a) | Range |
2024 | Power(c) | $ | 10 | $ | (78) | Discounted cash flow | Average forward peak and off-peak pricing – forwards/swaps ($/MWh) | 31 – 59 | 40 |
|  |  |  |  |  |  | Nodal basis ($/MWh) | (8) – 1 | (5) |
2023 | Power(c) | $ | 5 | $ | (69) | Discounted cash flow | Average forward peak and off-peak pricing – forwards/swaps ($/MWh) | 31 – 65 | 43 |
|  |  |  |  |  |  | Nodal basis ($/MWh) | (8) – (1) | (5) |
(a)Generally, significant increases (decreases) in these inputs in isolation would result in a significantly higher (lower) fair value measurement. (b)Unobservable inputs were weighted by relative fair value. (c)Valuations use visible forward prices adjusted for nodal-to-hub basis differentials.
Schedule of Financial Assets and Liabilities | The following table sets forth the carrying amount and, by level within the fair value hierarchy, the fair value of long-term debt (including current portion) disclosed, but not recorded, at fair value as of September 30, 2024, and December 31, 2023:
Long-Term Debt (Including Current Portion): | Carrying Amount(a) |  |  |  | Fair Value |  |
|  |  | Level 2 |  | Level 3 |  | Total
| September 30, 2024
Ameren | $ | 16,722 |  |  |  |  | $ | 15,303 |  |  | $ | 570 |  | (b) | $ | 15,873 |
Ameren Missouri | 6,830 |  |  |  |  | 6,409 |  |  | — |  |  | 6,409 |
Ameren Illinois | 5,852 |  |  |  |  | 5,560 |  |  | — |  |  | 5,560 |
| December 31, 2023
Ameren | $ | 15,970 |  |  |  |  | $ | 14,366 |  |  | $ | 467 |  | (b) | $ | 14,833 |
Ameren Missouri | 6,341 |  |  |  |  | 5,800 |  |  | — |  |  | 5,800 |
Ameren Illinois | 5,232 |  |  |  |  | 4,867 |  |  | — |  |  | 4,867 |
(a)Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $123 million, $53 million, and $52 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of September 30, 2024. Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $111 million, $45 million, and $47 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of December 31, 2023. (b)The Level 3 fair value amount consists of ATXI’s senior unsecured notes.

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