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Proprietary Capital Proprietary Capital (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Appropriation Investment      
Amount of appropriation investment that must be repaid $ 1,000,000,000    
Unpaid appropriation investment 10,000,000    
Remaining appropriation investment 258,000,000    
Balance at beginning of year 5,326,000,000 5,229,000,000 5,137,000,000
Net income (loss) 271,000,000 60,000,000 162,000,000
Return of power program appropriation investment 20,000,000 20,000,000 20,000,000
Return on power program appropriation investment 7,000,000 7,000,000 7,000,000
Balance at end of year 5,647,000,000 5,326,000,000 5,229,000,000
Net proprietary capital at September 30 5,647,000,000 5,326,000,000  
Computed average interest rate payable 2.10% 2.33% 2.40%
Nonpower Programs Appropriation Investment
      
Appropriation Investment      
Balance at beginning of year 4,351,000,000 4,351,000,000  
Return of power program appropriation investment 0 0  
Balance at end of year 4,351,000,000 4,351,000,000  
Power Program Appropriation Investment
      
Appropriation Investment      
Balance at beginning of year 288,000,000 308,000,000 328,000,000
Net income (loss) 0 0 0
Return of power program appropriation investment 20,000,000 20,000,000 20,000,000
Return on power program appropriation investment 0 0 0
Balance at end of year 268,000,000 288,000,000 308,000,000
Power Program Retained Earnings
      
Appropriation Investment      
Balance at beginning of year 4,492,000,000 4,429,000,000 4,264,000,000
Net income (loss) 282,000,000 70,000,000 172,000,000
Return of power program appropriation investment 0 0 0
Return on power program appropriation investment 7,000,000 7,000,000 7,000,000
Balance at end of year 4,767,000,000 4,492,000,000 4,429,000,000
Net proprietary capital at September 30 5,035,000,000 4,780,000,000  
Nonpower Programs Retained Earnings
      
Appropriation Investment      
Balance at beginning of year (3,731,000,000) (3,721,000,000)  
Net income (loss) (11,000,000) (10,000,000)  
Return on power program appropriation investment 0 0  
Balance at end of year (3,742,000,000) (3,731,000,000)  
Net proprietary capital at September 30 609,000,000 620,000,000  
Power Program Appropriation Investment
      
Appropriation Investment      
Return of power program appropriation investment $ 20,000,000 $ 20,000,000 $ 20,000,000