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Supplemental Information (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | $ 37 | $ 34 | $ 30 | $ 31 |
Bad debt expense | 6 | 13 | 16 | 23 |
Charged to other accounts | 1 | 1 | 4 | 1 |
Net write-offs | (7) | (9) | (13) | (16) |
End of period | 37 | 39 | 37 | 39 |
Payables for purchased receivables | 49 |  | 49 |  | $ 42
Union Electric Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 11 | 12 | 12 | 13 |
Bad debt expense | 4 | 2 | 5 | 4 |
Net write-offs | (3) | (2) | (5) | (5) |
End of period | 12 | 12 | 12 | 12 |
Ameren Illinois Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 26 | 22 | 18 | 18 |
Bad debt expense | 2 | 11 | 11 | 19 |
Charged to other accounts | 1 | 1 | 4 | 1 |
Net write-offs | (4) | (7) | (8) | (11) |
End of period | 25 | $ 27 | 25 | $ 27 |
Payables for purchased receivables | $ 49 |  | $ 49 |  | $ 42

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