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Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Supplemental Cash Flow Information [Line Items] |  |
Accrued capital expenditures, including nuclear fuel expenditures | $ 381 | $ 310
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund | (40) | 74
Issuance of common stock for stock-based compensation |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 25 | 16
Issuance of common stock under the DRPlus |  |
Supplemental Cash Flow Information [Line Items] |  |
Stock Issued | 9 | 7
Union Electric Company |  |
Supplemental Cash Flow Information [Line Items] |  |
Accrued capital expenditures, including nuclear fuel expenditures | 214 | 169
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund | (40) | 74
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 | 159 | 122
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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- 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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