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Fair Value Measurements (Tables)
 12 Months Ended
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, 2022December 31, 2021
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:
Ameren Missouri
Derivative assets – commodity contracts:
Fuel oils$16 $— $— $16 $13 $— $— $13 
Natural gas1 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 
Power57 — 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 $7 million of cash and cash equivalents, receivables, payables, and accrued income, net for December 31, 2022 and 2021, respectively.
(b)See the Ameren Missouri and Ameren Illinois sections of the table for a breakout of the fair value of Ameren’s derivative assets and liabilities by type of commodity.
(c)See the Ameren Missouri section of the table for a breakout of Ameren’s nuclear decommissioning trust fund by investment type.
Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level 3 In The Fair Value Hierarchy The following table presents the fair value reconciliation of Level 3 power derivative contract assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2022 and 2021:
20222021
Ameren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois		Ameren
Beginning balance at January 1$(15)$(117)$(132)$2 $(198)$(196)
Realized and unrealized gains (losses) included in regulatory assets/liabilities(45)92 47 (1)70 69 
Settlements72 (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)
CommodityAssetsLiabilitiesValuation Technique(s)
Unobservable Input(a)
Range
2022
Power(c)
$20 $(41)Discounted cash flowAverage forward peak and off-peak pricing – forwards/swaps ($/MWh)
38 – 89
51
Nodal basis ($/MWh)
(10) – (1)
(4)
Trend rate (%)
0 – 1
0
2021
Power(d)
$13 $(145)Discounted cash flowAverage forward peak and off-peak pricing – forwards/swaps ($/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 1Level 2Level 3Total
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 debt1,070 — 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 debt329 — 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 debt264 — 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 debt545 — 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 debt165 — 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 debt103 — 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.