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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument              
Total long-term debt, net $ 19,001     $ 19,001   $ 20,183  
Redemptions and repurchases of power bonds       $ 1,286 [1] $ 1,034    
Variable Interest Entity, Financial or Other Support, Type       20      
Total redemptions/maturities of debt [1]       $ (1,329)      
Proceeds from Issuance of Debt       997 0    
Debt Instrument, Unamortized Discount (3)     (3)      
Repayments of Notes Payable       23 $ 46    
2020 Series A              
Debt Instrument              
Proceeds from Issuance of Debt       1,000      
electronotes [Member]              
Debt Instrument              
Redemptions and repurchases of power bonds 1   $ 217        
2009 Series B [Member]              
Debt Instrument              
Redemptions and repurchases of power bonds $ 27 $ 1,000 $ 1        
Debt of variable interest entities [Member]              
Debt Instrument              
Other Debt instrument, Interest Rate, Effective Percentage             4.32%
1998 Series D              
Debt Instrument              
Redemptions and repurchases of power bonds       17      
1999 Series A Member              
Debt Instrument              
Redemptions and repurchases of power bonds       $ 23      
2020 Series A              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 0.75%     0.75%      
electronotes [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 2.65%   3.33% 2.65%      
1998 Series D              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 3.55%     3.55%      
1999 Series A Member              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 3.36%     3.36%      
2009 Series B [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 3.77% 2.25% 3.77% 3.77%      
Notes Payable [Member]              
Debt Instrument              
Debt Instrument, Interest Rate, Effective Percentage 1.64%     1.64%      
[1]
(1) The 2020 Series A Power Bonds were issued at 99.7 percent of par.
(2) All redemptions were at 100 percent of par.