v3.25.2
CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2023
Power Program Appropriation Investment $ 258,000,000     $ 258,000,000        
Power Program Retained Earnings 17,182,000,000     17,182,000,000        
Nonpower Programs Appropriation Investment, Net 512,000,000     512,000,000        
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (43,000,000) $ (32,000,000) $ (26,000,000) (43,000,000) $ (32,000,000) $ (52,000,000) $ (52,000,000) $ (29,000,000)
Total Proprietary Capital 17,909,000,000 16,663,000,000 16,489,000,000 17,909,000,000 16,663,000,000 17,690,000,000 17,161,000,000 16,056,000,000
Net income (loss) 212,000,000 181,000,000 615,000,000 745,000,000 615,000,000      
Total other comprehensive income (loss) 9,000,000 (6,000,000) (3,000,000) 9,000,000 (3,000,000)      
Return on power program appropriation investment (2,000,000) (1,000,000) (5,000,000) (6,000,000)        
Power Program Appropriation Investment                
Power Program Appropriation Investment 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000
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 17,182,000,000 15,917,000,000 15,736,000,000 17,182,000,000 15,917,000,000 16,970,000,000 16,437,000,000 15,302,000,000
Net income (loss) 214,000,000 182,000,000   751,000,000 620,000,000      
Total other comprehensive income (loss) 0 0   0 0      
Return on power program appropriation investment (2,000,000) (1,000,000)   (6,000,000) (5,000,000)      
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 512,000,000 520,000,000 $ 521,000,000 512,000,000 520,000,000 $ 514,000,000 $ 518,000,000 $ 525,000,000
Net income (loss) (2,000,000) (1,000,000)   (6,000,000) (5,000,000)      
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                
Net income (loss) 0 0   0 0      
Total other comprehensive income (loss) 9,000,000 (6,000,000)   9,000,000 (3,000,000)      
Return on power program appropriation investment $ 0 $ 0   $ 0 $ 0