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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Allowance for Uncollectible Accounts        
Period of time for customers to fulfill payment arrangements 90 days      
Loans receivable $ 92 $ 73    
Allowance for uncollectible accounts - receivables 1 1 7 1
Additions charged to expense - receivables 1 0 6  
Deductions - receivables (1) (6) 0  
Allowance for uncollectible accounts - loans 9 10 12 11
Additions charged to expense - loans 0 0 1  
Deductions - loans (1) (2) 0  
Total allowances deducted from assets 10 11 19 12
Total additions 1 0 7  
Total deductions $ (2) $ (8) $ 0