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STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (USD $)
In Millions
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Balance at Beginning of Period$ 5,137$ 4,218$ 3,563
Net income (loss)162972726
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges(50)(37)(146)
Reclassification to earnings from cash flow hedges717108
Total other comprehensive income (loss)(43)(20)(38)
Return on power program appropriation investment(7)(9)(13)
Return of power program appropriation investment(20)(24)(20)
Balance at End of Period5,2295,1374,218
Power Program Appropriation Investment
   
Balance at Beginning of Period328348368
Net income (loss)000
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges000
Reclassification to earnings from cash flow hedges000
Total other comprehensive income (loss)000
Return on power program appropriation investment000
Return of power program appropriation investment(20)(20)(20)
Balance at End of Period308328348
Power Program Retained Earnings
   
Balance at Beginning of Period4,2643,2912,571
Net income (loss)172982733
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges000
Reclassification to earnings from cash flow hedges000
Total other comprehensive income (loss)000
Return on power program appropriation investment(7)(9)(13)
Return of power program appropriation investment000
Balance at End of Period4,4294,2643,291
Nonpower Programs Appropriation Investment Net
   
Balance at Beginning of Period640654661
Net income (loss)(10)(10)(7)
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges000
Reclassification to earnings from cash flow hedges000
Total other comprehensive income (loss)000
Return on power program appropriation investment000
Return of power program appropriation investment0(4)0
Balance at End of Period630640654
Accumulated Other Comprehensive Income (Loss)
   
Balance at Beginning of Period(95)(75)(37)
Net income (loss)000
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges(50)(37)(146)
Reclassification to earnings from cash flow hedges717108
Total other comprehensive income (loss)(43)(20)(38)
Return on power program appropriation investment000
Return of power program appropriation investment000
Balance at End of Period(138)(95)(75)
Comprehensive Income (Loss)
   
Net income (loss)162972726
Other comprehensive income (loss)   
Net unrealized loss on future cash flow hedges(50)(37)(146)
Reclassification to earnings from cash flow hedges717108
Total other comprehensive income (loss)(43)(20)(38)
Total comprehensive income (loss)$ 119$ 952$ 688