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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Balance at beginning of year   $ 11,625   $ 10,283 $ 11,625 $ 10,283 $ 9,133
Net income (loss) $ 700 192 $ 588 423 1,352 1,417 1,119
Total other comprehensive income (loss)         (39) (69) 36
Return on power program appropriation investment         (6) (6) (5)
Balance at end of year 12,932   11,625   12,932 11,625 10,283
Power Program Appropriation Investment              
Balance at beginning of year   258   258 258 258 258
Net income (loss)         0 0 0
Total other comprehensive income (loss)         0 0 0
Return on power program appropriation investment         0 0 0
Balance at end of year 258   258   258 258 258
Power Program Retained Earnings              
Balance at beginning of year   10,823   9,404 10,823 9,404 8,282
Net income (loss)         1,360 1,425 1,127
Total other comprehensive income (loss)         0 0 0
Return on power program appropriation investment         (6) (6) (5)
Balance at end of year 12,177   10,823   12,177 10,823 9,404
Nonpower Programs Appropriation Investment, Net              
Balance at beginning of year   556   564 556 564 572
Net income (loss)         (8) (8) (8)
Total other comprehensive income (loss)         0 0 0
Return on power program appropriation investment         0 0 0
Balance at end of year 548   556   548 556 564
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges              
Balance at beginning of year   $ (12)   $ 57 (12) 57 21
Net income (loss)         0 0 0
Total other comprehensive income (loss)         (39) (69) 36
Return on power program appropriation investment         0 0 0
Balance at end of year $ (51)   $ (12)   $ (51) $ (12) $ 57