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Related Parties Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Related Parties                      
Remaining appropriation investment $ 258       $ 258       $ 258 $ 258  
Current borrowing capacity 150               150    
Revenue from sales of electricity 3,185 $ 2,707 $ 2,792 $ 2,549 3,075 $ 2,571 $ 2,547 $ 2,546 11,233 10,739 $ 10,616
Return on power program appropriation investment                 (5) (5) (6)
Related Party Transactions                      
Related Parties                      
Revenue from sales of electricity                 122 126 126
Other income                 240 136 161
Operating expenses                 220 216 216
Additions to property, plant, and equipment                 8 16 32
Cash and cash equivalents 46       46       46 46 54
Accounts receivable, net 60       84       60 84 68
Receivables, Long-term Contracts or Programs 46       35       46 35 61
Accounts payable and accrued liabilities 69       71       69 71 77
Long-term power bonds, net $ 0       $ 1       0 1 4
Return on power program appropriation investment                 $ (5) $ (5) $ (6)