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Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Supplemental Cash Flow Information [Line Items] |  |  |
Wind generation expenditures | $ 224 |  | $ 417
Accrued capital expenditures |  | $ 408 | 434
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund |  | (211) | 85
Issuance of common stock for stock-based compensation |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued |  | 31 | 33
Issuance of common stock under the DRPlus |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Stock Issued |  | 8 | 0
Union Electric Company |  |  |
Supplemental Cash Flow Information [Line Items] |  |  |
Wind generation expenditures | $ 224 |  | 417
Accrued capital expenditures |  | 204 | 259
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund |  | (211) | 85
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 |  | 193 | 174
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund |  | 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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