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Proprietary Capital Proprietary Capital (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Appropriation Investment                      
Amount of appropriation investment that must be repaid $ 1,000,000,000               $ 1,000,000,000    
Remaining appropriation investment 258,000,000               258,000,000    
Balance at beginning of year       5,647,000,000       5,326,000,000 5,647,000,000 5,326,000,000 5,229,000,000
Net income (loss) 322,000,000 (81,000,000) 295,000,000 (67,000,000) 474,000,000 (12,000,000) 54,000,000 (245,000,000) 469,000,000 271,000,000 60,000,000
Return of power program appropriation investment                 10,000,000 20,000,000 20,000,000
Return on power program appropriation investment                 4,000,000 7,000,000 7,000,000
Balance at end of year 6,104,000,000       5,647,000,000       6,104,000,000 5,647,000,000 5,326,000,000
Net proprietary capital at September 30 6,104,000,000       5,647,000,000       6,104,000,000 5,647,000,000  
Computed average interest rate payable 1.97%       2.10%       1.97% 2.10% 2.33%
Nonpower Programs Appropriation Investment
                      
Appropriation Investment                      
Balance at beginning of year       4,351,000,000       4,351,000,000 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       4,351,000,000 4,351,000,000  
Power Program Appropriation Investment
                      
Appropriation Investment                      
Balance at beginning of year       268,000,000       288,000,000 268,000,000 288,000,000 308,000,000
Net income (loss)                 0 0 0
Return of power program appropriation investment                 10,000,000 20,000,000 20,000,000
Return on power program appropriation investment                 0 0 0
Balance at end of year 258,000,000       268,000,000       258,000,000 268,000,000 288,000,000
Power Program Retained Earnings
                      
Appropriation Investment                      
Balance at beginning of year       4,767,000,000       4,492,000,000 4,767,000,000 4,492,000,000 4,429,000,000
Net income (loss)                 477,000,000 282,000,000 70,000,000
Return of power program appropriation investment                 0 0 0
Return on power program appropriation investment                 4,000,000 7,000,000 7,000,000
Balance at end of year 5,240,000,000       4,767,000,000       5,240,000,000 4,767,000,000 4,492,000,000
Net proprietary capital at September 30 5,498,000,000       5,035,000,000       5,498,000,000 5,035,000,000  
Nonpower Programs Retained Earnings
                      
Appropriation Investment                      
Balance at beginning of year       (3,742,000,000)       (3,731,000,000) (3,742,000,000) (3,731,000,000)  
Net income (loss)                 (8,000,000) (11,000,000)  
Return on power program appropriation investment                 0 0  
Balance at end of year (3,750,000,000)       (3,742,000,000)       (3,750,000,000) (3,742,000,000)  
Net proprietary capital at September 30 601,000,000       609,000,000       601,000,000 609,000,000  
Power Program Appropriation Investment
                      
Appropriation Investment                      
Return of power program appropriation investment                 $ 10,000,000 $ 20,000,000