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Supplemental Information (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | $ 34 | $ 28 | $ 31 | $ 29 |
Bad debt expense | 13 | 6 | 23 | 9 |
Charged to other accounts | 1 | 1 | 1 | 2 |
Net write-offs | (9) | (5) | (16) | (10) |
End of period | 39 | $ 30 | 39 | $ 30 |
Payables for purchased receivables | $ 37 |  | $ 37 |  | $ 31
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 26.00% | 19.00% | 26.00% | 19.00% |
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 133 | $ 107 | $ 133 | $ 107 |
Union Electric Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 12 | 11 | 13 | 13 |
Bad debt expense | 2 | 2 | 4 | 3 |
Net write-offs | (2) | (1) | (5) | (4) |
End of period | $ 12 | $ 12 | $ 12 | $ 12 |
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 15.00% | 14.00% | 15.00% | 14.00% |
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 28 | $ 29 | $ 28 | $ 29 |
Ameren Illinois Company |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning of period | 22 | 17 | 18 | 16 |
Bad debt expense | 11 | 4 | 19 | 6 |
Charged to other accounts | 1 | 1 | 1 | 2 |
Net write-offs | (7) | (4) | (11) | (6) |
End of period | 27 | $ 18 | 27 | $ 18 |
Payables for purchased receivables | $ 37 |  | $ 37 |  | $ 31
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 35.00% | 24.00% | 35.00% | 24.00% |
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 106 | $ 78 | $ 106 | $ 78 |

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