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Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplemental Cash Flow Information [Line Items] |  |  |
Wind generation expenditures |  | $ 525 | $ 564
Accrued capital expenditures | $ 441 | 524 | 446
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | (218) | 163 | 116
Stock Issued |  | 33 |
Issuance of common stock for stock-based compensation |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | 31 | 33 | 38
Issuance of common stock under the DRPlus |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | 8 | 0 | 0
Union Electric Company |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Wind generation expenditures |  | 525 | 564
Accrued capital expenditures | 243 | 301 | 229
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | (218) | 163 | 116
Union Electric Company | Issuance of common stock for stock-based compensation |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | 0 | 0 | 0
Union Electric Company | Issuance of common stock under the DRPlus |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | 0 | 0 | 0
Ameren Illinois Company |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Accrued capital expenditures | 181 | 215 | 218
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | 0 | 0 | 0
Ameren Illinois Company | Issuance of common stock for stock-based compensation |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | 0 | 0 | 0
Ameren Illinois Company | Issuance of common stock under the DRPlus |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued | $ 0 | $ 0 | $ 0

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