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Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Supplemental Cash Flow Information [Line Items] |  |
Accrued capital expenditures, including nuclear fuel expenditures | $ 310 | $ 298
Net realized and unrealized gain – nuclear decommissioning trust fund | 74 | 54
Return on investment in industrial development revenue bonds | 0 | 240
Termination of a financing obligation | 0 | 240
Issuance of common stock for stock-based compensation |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 16 | 37
Issuance of common stock under the DRPlus |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 7 | 7
Union Electric Company |  |
Supplemental Cash Flow Information [Line Items] |  |
Accrued capital expenditures, including nuclear fuel expenditures | 169 | 153
Net realized and unrealized gain – nuclear decommissioning trust fund | 74 | 54
Return on investment in industrial development revenue bonds | 0 | 240
Termination of a financing obligation | 0 | 240
Union Electric Company | Issuance of common stock for stock-based compensation |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 0 | 0
Union Electric Company | Issuance of common stock under the DRPlus |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 0 | 0
Ameren Illinois Company |  |
Supplemental Cash Flow Information [Line Items] |  |
Accrued capital expenditures, including nuclear fuel expenditures | 122 | 138
Net realized and unrealized gain – nuclear decommissioning trust fund | 0 | 0
Return on investment in industrial development revenue bonds | 0 | 0
Termination of a financing obligation | 0 | 0
Ameren Illinois Company | Issuance of common stock for stock-based compensation |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 0 | 0
Ameren Illinois Company | Issuance of common stock under the DRPlus |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | $ 0 | $ 0

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