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Accounts Receivable, Net | 12 Months Ended
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Sep. 30, 2011
Receivables [Abstract] |
Accounts Receivable, Net | Accounts Receivable, Net Accounts receivable primarily consist of amounts due from customers for power sales. The table below summarizes the types and amounts of receivables:
Accounts Receivable, Net At September 30
| 2011 |  | 2010
Power receivables |  |  |
Billed | $ | 1,625 |  |  | $ | 597 |
Unbilled | 13 |  |  | 1,004 |
Total power receivables | 1,638 |  |  | 1,601 |
Other receivables | 102 |  |  | 40 |
Allowance for uncollectible accounts | $ | (1 | ) |  | $ | (2 | )
Accounts receivable, net | $ | 1,739 |  |  | $ | 1,639 |
The $991 million decrease in unbilled power receivables and the $1.0 billion increase in billed receivables are primarily due to the implementation of a new wholesale rate structure in April 2011. Under the previous end-use billing structure, sales were billed a month in arrears. Under the new wholesale base rate structure, customers are billed in the current month.

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