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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Open Gross Derivative Volumes By Commodity Type | The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of December 31, 2022 and 2021. As of December 31, 2022, these contracts extended through October 2024, March 2029, May 2032, and March 2024 for fuel oils, natural gas, power, and uranium, respectively.
| Quantity (in millions, except as indicated)
| 2022 | 2021
Commodity | Ameren Missouri | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois | Ameren
Fuel oils (in gallons) | 18 |  | — |  | 18 |  | 30 |  | — |  | 30 |
Natural gas (in mmbtu) | 48 |  | 157 |  | 205 |  | 35 |  | 144 |  | 179 |
Power (in MWhs) | 1 |  | 6 |  | 7 |  | 6 |  | 6 |  | 12 |
Uranium (pounds in thousands) | 514 |  | — |  | 514 |  | 586 |  | — |  | 586 |
Derivative Instruments Carrying Value | The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of December 31, 2022 and 2021:
| 2022 |  |  | 2021
Commodity | Balance Sheet Location |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren |  |  |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren
Fuel oils | Other current assets |  | $ | 13 |  |  |  | $ | — |  |  |  | $ | 13 |  |  |  |  | $ | 8 |  |  |  | $ | — |  |  |  | $ | 8 |
| Other assets |  | 3 |  |  |  | — |  |  |  | 3 |  |  |  |  | 5 |  |  |  | — |  |  |  | 5 |
Natural gas | Other current assets |  | 7 |  |  |  | 23 |  |  |  | 30 |  |  |  |  | 7 |  |  |  | 28 |  |  |  | 35 |
| Other assets |  | 9 |  |  |  | 11 |  |  |  | 20 |  |  |  |  | 5 |  |  |  | 13 |  |  |  | 18 |
Power | Other current assets |  | 14 |  |  |  | 2 |  |  |  | 16 |  |  |  |  | 23 |  |  |  | — |  |  |  | 23 |
| Other assets |  | — |  |  |  | 4 |  |  |  | 4 |  |  |  |  | — |  |  |  | — |  |  |  | — |
Uranium | Other current assets |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  |  | — |  |  |  | — |  |  |  | — |
| Other assets |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
| Total assets |  | $ | 49 |  |  |  | $ | 40 |  |  |  | $ | 89 |  |  |  |  | $ | 49 |  |  |  | $ | 41 |  |  |  | $ | 90 |
Natural gas | Other current liabilities |  | 7 |  |  |  | 20 |  |  |  | 27 |  |  |  |  | 2 |  |  |  | 6 |  |  |  | 8 |
| Other deferred credits and liabilities |  | 2 |  |  |  | 9 |  |  |  | 11 |  |  |  |  | 1 |  |  |  | 2 |  |  |  | 3 |
Power | Other current liabilities |  | 59 |  |  |  | 2 |  |  |  | 61 |  |  |  |  | 50 |  |  |  | 9 |  |  |  | 59 |
| Other deferred credits and liabilities |  | — |  |  |  | 37 |  |  |  | 37 |  |  |  |  | 23 |  |  |  | 108 |  |  |  | 131 |
Uranium | Other current liabilities |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
| Total liabilities |  | $ | 68 |  |  |  | $ | 68 |  |  |  | $ | 136 |  |  |  |  | $ | 77 |  |  |  | $ | 125 |  |  |  | $ | 202 |
Offsetting Assets and Liabilities | The following table provides the recognized gross derivative balances and the net amounts of those derivatives subject to an enforceable master netting arrangement or similar agreement as of December 31, 2022 and 2021:
|  |  |  | Gross Amounts Not Offset in the Balance Sheet |  |
Commodity Contracts Eligible to be Offset |  | Gross Amounts Recognized in the Balance Sheet |  | Derivative Instruments |  | Cash Collateral Received/Posted(a) |  | Net Amount
2022 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 49 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 40 |
Ameren Illinois | 40 |  |  | 20 |  |  | — |  |  | 20 |
Ameren | $ | 89 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 60 |
Liabilities: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 68 |  |  | $ | 9 |  |  | $ | 56 |  |  | $ | 3 |
Ameren Illinois | 68 |  |  | 20 |  |  | — |  |  | 48 |
Ameren | $ | 136 |  |  | $ | 29 |  |  | $ | 56 |  |  | $ | 51 |
2021 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 49 |  |  | $ | 15 |  |  | $ | — |  |  | $ | 34 |
Ameren Illinois | 41 |  |  | 4 |  |  | — |  |  | 37 |
Ameren | $ | 90 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 71 |
Liabilities: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 77 |  |  | $ | 15 |  |  | $ | 47 |  |  | $ | 15 |
Ameren Illinois | 125 |  |  | 4 |  |  | — |  |  | 121 |
Ameren | $ | 202 |  |  | $ | 19 |  |  | $ | 47 |  |  | $ | 136 |
(a)Cash collateral received reduces gross asset balances and is included in “Other current liabilities” and “Other deferred credits and liabilities” on the balance sheet. Cash collateral posted reduces gross liability balances and is included in “Current collateral assets” and “Other assets” on the balance sheet for Ameren and Ameren Missouri and “Other current assets” and “Other assets” for Ameren Illinois.

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