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Related Parties Related Parties (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Related Parties      
Amount of appropriations currently received $ 0    
Amount of appropriation investment that must be repaid 1,000,000,000    
Current borrowing capacity 150,000,000    
Sales of electricity 128,000,000 120,000,000 117,000,000
Other income 137,000,000 102,000,000 164,000,000
Operating and maintenance 286,000,000 314,000,000 375,000,000
Cash and cash equivalents 35,000,000 38,000,000 32,000,000
Accounts receivable, net 85,000,000 58,000,000 49,000,000
Accounts payable and accrued liabilities 146,000,000 133,000,000 204,000,000
Long-term power bonds, net 3,000,000 0 0
Return on power program appropriation investment 4,000,000 7,000,000 7,000,000
Return of power program appropriation investment $ 10,000,000 $ 20,000,000 $ 20,000,000