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Supplemental Information (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | $ 37 | $ 39 | $ 30 | $ 31 |
Bad debt expense | 12 | 18 | 28 | 41 |
Charged to other accounts | 2 | 2 | 6 | 3 |
Net write-offs | (20) | (26) | (33) | (42) |
End of period | 31 | 33 | 31 | 33 |
Payables for purchased receivables | 53 |  | 53 |  | $ 42
Union Electric Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 12 | 12 | 12 | 13 |
Bad debt expense | 3 | 5 | 8 | 9 |
Net write-offs | (3) | (5) | (8) | (10) |
End of period | 12 | 12 | 12 | 12 |
Ameren Illinois Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 25 | 27 | 18 | 18 |
Bad debt expense | 9 | 13 | 20 | 32 |
Charged to other accounts | 2 | 2 | 6 | 3 |
Net write-offs | (17) | (21) | (25) | (32) |
End of period | 19 | $ 21 | 19 | $ 21 |
Payables for purchased receivables | $ 53 |  | $ 53 |  | $ 42

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