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Accounts Receivable, Net
12 Months Ended
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.