| SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2012, 2011 AND 2010 | |||||||||||||||||||
| (in millions) | |||||||||||||||||||
| Column A | Column B | Column C | Column D | Column E | |||||||||||||||
| Description | Balance at Beginning of Period | (1) Charged to Costs and Expenses | (2) Charged to Other Accounts(a) | Deductions(b) | Balance at End of Period | ||||||||||||||
| Ameren: | |||||||||||||||||||
| Deducted from assets - allowance for doubtful accounts: | |||||||||||||||||||
| 2012 | $ | 20 | $ | 30 | $ | 2 | $ | 35 | $ | 17 | |||||||||
| 2011 | 22 | 41 | — | 43 | 20 | ||||||||||||||
| 2010 | 24 | 32 | — | 34 | 22 | ||||||||||||||
| Deferred tax valuation allowance: | |||||||||||||||||||
| 2012 | $ | 1 | $ | 1 | $ | — | $ | — | $ | 2 | |||||||||
| 2011 | 1 | — | — | — | 1 | ||||||||||||||
| 2010 | — | 1 | — | — | 1 | ||||||||||||||
| (a) | Uncollectible account reserve associated with receivables purchased by Ameren Illinois from alternative retail electric suppliers as required by the Illinois Public Utility Act. |
| (b) | Uncollectible accounts charged off, less recoveries. |
