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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2022
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 December 31, 2022 and 2021:
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | Level 1 | Level 2 | Level 3 | Total |  |  | Level 1 | Level 2 | Level 3 | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |
Ameren Missouri |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Fuel oils | $ | 16 |  | $ | — |  | $ | — |  | $ | 16 |  |  |  | $ | 13 |  | $ | — |  | $ | — |  | $ | 13 |  |
| Natural gas | 1 |  | 15 |  | — |  | 16 |  |  |  | — |  | 12 |  | — |  | 12 |  |
| Power | — |  | — |  | 14 |  | 14 |  |  |  | 10 |  | — |  | 13 |  | 23 |  |
| Uranium | — |  | — |  | 3 |  | 3 |  |  |  | — |  | — |  | 1 |  | 1 |  |
| Total derivative assets – commodity contracts | $ | 17 |  | $ | 15 |  | $ | 17 |  | $ | 49 |  |  |  | $ | 23 |  | $ | 12 |  | $ | 14 |  | $ | 49 |  |
| Nuclear decommissioning trust fund: |  |  |  |  |  |  |  |  |  |  |
| Equity securities: |  |  |  |  |  |  |  |  |  |  |
| U.S. large capitalization | $ | 618 |  | $ | — |  | $ | — |  | $ | 618 |  |  |  | $ | 824 |  | $ | — |  | $ | — |  | $ | 824 |  |
| Debt securities: |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and agency securities | — |  | 137 |  | — |  | 137 |  |  |  | — |  | 141 |  | — |  | 141 |  |
| Corporate bonds | — |  | 122 |  | — |  | 122 |  |  |  | — |  | 131 |  | — |  | 131 |  |
| Other | — |  | 70 |  | — |  | 70 |  |  |  | — |  | 56 |  | — |  | 56 |  |
| Total nuclear decommissioning trust fund | $ | 618 |  | $ | 329 |  | $ | — |  | $ | 947 |  | (a) |  | $ | 824 |  | $ | 328 |  | $ | — |  | $ | 1,152 |  | (a)
| Total Ameren Missouri | $ | 635 |  | $ | 344 |  | $ | 17 |  | $ | 996 |  |  |  | $ | 847 |  | $ | 340 |  | $ | 14 |  | $ | 1,201 |  |
Ameren Illinois |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Natural gas | $ | 1 |  | $ | 28 |  | $ | 5 |  | $ | 34 |  |  |  | $ | 1 |  | $ | 33 |  | $ | 7 |  | $ | 41 |  |
| Power | — |  | — |  | 6 |  | 6 |  |  |  | — |  | — |  | — |  | — |  |
| Total Ameren Illinois | $ | 1 |  | $ | 28 |  | $ | 11 |  | $ | 40 |  |  |  | $ | 1 |  | $ | 33 |  | $ | 7 |  | $ | 41 |  |
Ameren |  |  |  |  |  |  |  |  |  |  |
| Derivative assets – commodity contracts(b) | $ | 18 |  | $ | 43 |  | $ | 28 |  | $ | 89 |  |  |  | $ | 24 |  | $ | 45 |  | $ | 21 |  | $ | 90 |  |
| Nuclear decommissioning trust fund(c) | 618 |  | 329 |  | — |  | 947 |  | (a) |  | 824 |  | 328 |  | — |  | 1,152 |  | (a)
| Total Ameren | $ | 636 |  | $ | 372 |  | $ | 28 |  | $ | 1,036 |  |  |  | $ | 848 |  | $ | 373 |  | $ | 21 |  | $ | 1,242 |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Ameren Missouri |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Natural gas | $ | — |  | $ | 6 |  | $ | 3 |  | $ | 9 |  |  |  | $ | — |  | $ | 2 |  | $ | 1 |  | $ | 3 |  |
| Power | 57 |  | — |  | 2 |  | 59 |  |  |  | 45 |  | — |  | 28 |  | 73 |  |
| Uranium | — |  | — |  | — |  | — |  |  |  | — |  | — |  | 1 |  | 1 |  |
| Total Ameren Missouri | $ | 57 |  | $ | 6 |  | $ | 5 |  | $ | 68 |  |  |  | $ | 45 |  | $ | 2 |  | $ | 30 |  | $ | 77 |  |
Ameren Illinois |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts: |  |  |  |  |  |  |  |  |  |  |
| Natural gas | $ | — |  | $ | 19 |  | $ | 10 |  | $ | 29 |  |  |  | $ | — |  | $ | 5 |  | $ | 3 |  | $ | 8 |  |
| Power | — |  | — |  | 39 |  | 39 |  |  |  | — |  | — |  | 117 |  | 117 |  |
| Total Ameren Illinois | $ | — |  | $ | 19 |  | $ | 49 |  | $ | 68 |  |  |  | $ | — |  | $ | 5 |  | $ | 120 |  | $ | 125 |  |
Ameren |  |  |  |  |  |  |  |  |  |  |
| Derivative liabilities – commodity contracts(b) | $ | 57 |  | $ | 25 |  | $ | 54 |  | $ | 136 |  |  |  | $ | 45 |  | $ | 7 |  | $ | 150 |  | $ | 202 |  |
(a)Balance excludes $11 million and $7 million of cash and cash equivalents, receivables, payables, and accrued income, net for December 31, 2022 and 2021, 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 Ameren’s nuclear decommissioning trust fund by investment type.
Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level 3 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 years ended December 31, 2022 and 2021:
| 2022 |  |  | 2021
| Ameren Missouri | Ameren Illinois | Ameren |  |  | Ameren Missouri | Ameren Illinois | Ameren
Beginning balance at January 1 | $ | (15) |  | $ | (117) |  | $ | (132) |  |  |  | $ | 2 |  | $ | (198) |  | $ | (196) |
Realized and unrealized gains (losses) included in regulatory assets/liabilities | (45) |  | 92 |  | 47 |  |  |  | (1) |  | 70 |  | 69 |
Settlements | 72 |  | (8) |  | 64 |  |  |  | (16) |  | 11 |  | (5) |
Ending balance at December 31 | $ | 12 |  | $ | (33) |  | $ | (21) |  |  |  | $ | (15) |  | $ | (117) |  | $ | (132) |
Change in unrealized gains (losses) related to assets/liabilities held at December 31 | $ | 12 |  | $ | 75 |  | $ | 87 |  |  |  | $ | (14) |  | $ | 65 |  | $ | 51 |
Fair Value Inputs, Assets and Liabilities, Quantitative Information | 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 December 31, 2022 and 2021:
|  | Fair Value |  |  |  |  | Weighted Average(b)
| Commodity | Assets | Liabilities |  | Valuation Technique(s) | Unobservable Input(a) | Range
2022 | Power(c) | $ | 20 |  | $ | (41) |  |  | Discounted cash flow | Average forward peak and off-peak pricing – forwards/swaps ($/MWh) | 38 – 89 | 51
|  |  |  |  |  | Nodal basis ($/MWh) | (10) – (1) | (4)
|  |  |  |  |  | Trend rate (%) | 0 – 1 | 0
2021 | Power(d) | $ | 13 |  | $ | (145) |  |  | Discounted cash flow | Average forward peak and off-peak pricing – forwards/swaps ($/MWh) | 32 – 55 | 40
|  |  |  |  |  | Nodal basis ($/MWh) | (14) – 0 | (2)
|  |  |  |  |  | Trend rate (%) | (e) | 0
(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 through 2031 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2031 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. (d)Valuations through 2029 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2029 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. (e)No meaningful range around weighted average.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] | The following table sets forth, by level within the fair value hierarchy, the carrying amount and fair value of financial assets and liabilities disclosed, but not carried, at fair value as of December 31, 2022 and 2021:
| Carrying Amount |  | Fair Value |  |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| December 31, 2022
Ameren: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 216 |  |  | $ | 216 |  |  | $ | — |  |  | $ | — |  |  | $ | 216 |
Investments in industrial development revenue bonds(a) | 240 |  |  | — |  |  | 240 |  |  | — |  |  | 240 |
Short-term debt | 1,070 |  |  | — |  |  | 1,070 |  |  | — |  |  | 1,070 |
Long-term debt (including current portion)(a) | 14,025 |  | (b) | — |  |  | 11,989 |  |  | 464 |  | (c) | 12,453 |
Ameren Missouri: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 13 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | 13 |
Investments in industrial development revenue bonds(a) | 240 |  |  | — |  |  | 240 |  |  | — |  |  | 240 |
Short-term debt | 329 |  |  | — |  |  | 329 |  |  | — |  |  | 329 |
Long-term debt (including current portion)(a) | 6,086 |  | (b) | — |  |  | 5,365 |  |  | — |  |  | 5,365 |
Ameren Illinois: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 191 |  |  | $ | 191 |  |  | $ | — |  |  | $ | — |  |  | $ | 191 |
Short-term debt | 264 |  |  | — |  |  | 264 |  |  | — |  |  | 264 |
Long-term debt (including current portion) | 4,835 |  | (b) | — |  |  | 4,320 |  |  | — |  |  | 4,320 |
| December 31, 2021
Ameren: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 155 |  |  | $ | 155 |  |  | $ | — |  |  | $ | — |  |  | $ | 155 |
Investments in industrial development revenue bonds(a) | 248 |  |  | — |  |  | 248 |  |  | — |  |  | 248 |
Short-term debt | 545 |  |  | — |  |  | 545 |  |  | — |  |  | 545 |
Long-term debt (including current portion)(a) | 13,067 |  | (b) | — |  |  | 13,930 |  |  | 591 |  | (c) | 14,521 |
Ameren Missouri: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 8 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Investments in industrial development revenue bonds(a) | 248 |  |  | — |  |  | 248 |  |  | — |  |  | 248 |
Short-term debt | 165 |  |  | — |  |  | 165 |  |  | — |  |  | 165 |
Long-term debt (including current portion)(a) | 5,619 |  | (b) | — |  |  | 6,321 |  |  | — |  |  | 6,321 |
Ameren Illinois: |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ | 133 |  |  | $ | 133 |  |  | $ | — |  |  | $ | — |  |  | $ | 133 |
Short-term debt | 103 |  |  | — |  |  | 103 |  |  | — |  |  | 103 |
Long-term debt (including current portion) | 4,392 |  | (b) | — |  |  | 4,971 |  |  | — |  |  | 4,971 |
(a)Ameren and Ameren Missouri had investments in industrial development revenue bonds, classified as held-to-maturity and recorded in “Investments in industrial development revenue bonds,” and primarily in “Other assets,” as of December 31, 2022 and 2021, respectively, that were equal to the finance obligations for the Peno Creek and Audrain CT energy centers. As of December 31, 2022 and 2021, the carrying amount of the investments in industrial development revenue bonds and the finance obligations approximated fair value. The financing obligation for the Peno Creek CT Energy Center was settled in December 2022, while the financing obligation for the Audrain CT Energy Center was settled in January 2023. See Note 5 – Long-term Debt and Equity Financings for additional information on these agreements. (b)Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $99 million, $41 million, and $44 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of December 31, 2022. Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $94 million, $38 million, and $39 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of December 31, 2021. (c)The Level 3 fair value amount consists of ATXI’s senior unsecured notes.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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