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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Power Program Appropriation Investment $ 258   $ 258  
Power Program Retained Earnings 9,827   9,404  
Nonpower Programs Appropriation Investment, Net 562   564  
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges 23   57  
Total Proprietary Capital 10,670 $ 9,456 10,283 $ 9,133
Net income (loss) 423 288    
Total other comprehensive income (loss) (34) 36    
Return on power program appropriation investment (2) (1)    
Power Program Appropriation Investment        
Power Program Appropriation Investment 258 258 258 258
Net income (loss) 0 0    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
Power Program Retained Earnings        
Power Program Retained Earnings 9,827 8,571 9,404 8,282
Net income (loss) 425 290    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (2) (1)    
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 562 570 564 572
Net income (loss) (2) (2)    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges 23 57 $ 57 $ 21
Net income (loss) 0 0    
Total other comprehensive income (loss)   36    
Return on power program appropriation investment $ 0 $ 0