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Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplemental Cash Flow Information [Line Items] |  |  |  |
Accrued capital expenditures |  | $ 480 | $ 518 | $ 441
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund |  | 165 | 167 | (218)
Return on investment in industrial development revenue bonds |  | 0 | 240 | 0
Stock Issued |  |  | 40 |
Termination of a financing obligation |  | 0 | 240 | 0
Issuance of common stock for stock-based compensation |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | 16 | 40 | 31
Issuance of common stock under the DRPlus |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | 7 | 7 | 8
Ameren Missouri |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Accrued capital expenditures |  | 303 | 270 | 243
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund |  | 165 | 167 | (218)
Return on investment in industrial development revenue bonds |  | 0 | 240 | 0
Termination of a financing obligation | $ 240 | 0 | 240 | 0
Ameren Missouri | Issuance of common stock for stock-based compensation |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | 0 | 0 | 0
Ameren Missouri | Issuance of common stock under the DRPlus |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | 0 | 0 | 0
Ameren Illinois |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Accrued capital expenditures |  | 157 | 212 | 181
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund |  | 0 | 0 | 0
Return on investment in industrial development revenue bonds |  | 0 | 0 | 0
Termination of a financing obligation |  | 0 | 0 | 0
Ameren Illinois | Issuance of common stock for stock-based compensation |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | 0 | 0 | 0
Ameren Illinois | Issuance of common stock under the DRPlus |  |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |  |
Stock Issued |  | $ 0 | $ 0 | $ 0

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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