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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Power Program Appropriation Investment $ 258   $ 258     $ 258    
Power Program Retained Earnings 10,069   10,069     9,404    
Nonpower Programs Appropriation Investment, Net 560   560     564    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges 32   32     57    
Total Proprietary Capital 10,919 $ 9,932 10,919 $ 9,932 $ 10,670 10,283 $ 9,456 $ 9,133
Net income (loss) 241 462 664 750        
Total other comprehensive income (loss) 9 16 (25) 52        
Return on power program appropriation investment (1) (2) (3) (3)        
Power Program Appropriation Investment                
Power Program Appropriation Investment 258 258 258 258 258 258 258 258
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment 0 0 0 0        
Power Program Retained Earnings                
Power Program Retained Earnings 10,069 9,033 10,069 9,033 9,827 9,404 8,571 8,282
Net income (loss) 243 464 668 754        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (1) (2) (3) (3)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 560 568 560 568 562 564 570 572
Net income (loss) (2) (2) (4) (4)        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment 0 0 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 32 73 32 73 $ 23 $ 57 $ 57 $ 21
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss)   16   52        
Return on power program appropriation investment $ 0 $ 0 $ 0 $ 0