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Related Parties Related Parties (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Related Parties                      
Remaining appropriation investment $ 258               $ 258    
Current borrowing capacity 150               150    
Revenue from sales of electricity 2,899 $ 2,251 $ 2,521 $ 2,578 $ 3,239 $ 2,604 $ 2,750 $ 2,725 10,249 $ 11,318 $ 11,233
Other income                   21 0
Long-term Investments 3,198       2,968       3,198 2,968  
Return on power program appropriation investment                 (6) (6) (5)
Related Party Transactions                      
Related Parties                      
Revenue from sales of electricity                 105 118 122
Other income                 260 258 240
Operating expenses                 224 222 220
Additions to property, plant, and equipment                 9 10 8
Cash and cash equivalents 31       45       31 45 46
Receivables from Customers 94       76       94 76 60
Long-term Investments 485       279       485 279 199
Receivables, Long-term Contracts or Programs 27       53       27 53 46
Accounts payable and accrued liabilities 39       69       39 69 69
Long-term power bonds, net $ 1       $ 0       1 0 0
Return on power program appropriation investment                 $ (6) $ (6) $ (5)