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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument              
Repayments of Other Long-term Debt         19    
Foreign Currency Transaction Gain (Loss), before Tax $ 167 $ 147          
Total long-term debt, net $ 20,223 $ 21,307     $ 20,223    
Redemptions/maturities of power bonds         1,034 [1] $ 1,731  
Total redemptions/maturities of debt [1]         (1,099)    
Notes Issued         46    
Notes Payable [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage     1.27%     1.27%  
electronotes [Member]              
Debt Instrument              
Redemptions/maturities of power bonds     $ 2 $ 1 1    
Debt Instrument, Interest Rate, Effective Percentage     1.75%     1.75%  
2009 Series B [Member]              
Debt Instrument              
Redemptions/maturities of power bonds         1 $ 29  
2013 Series A [Member]              
Debt Instrument              
Redemptions/maturities of power bonds         $ 1,000    
Total              
Debt Instrument              
Percent of par value 100.00%       100.00%    
Debt of variable interest entities [Member]              
Debt Instrument              
Other Debt instrument, Interest Rate, Effective Percentage     4.31%     4.31%  
2018 Series A [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage     2.89% 3.48%   2.89%  
1997 Series E [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage             3.77%
electronotes [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 2.65%       2.65%    
2009 Series B [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage             3.77%
[1] (1) All redemptions were at 100 percent of par.