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SENIOR NOTES PAYABLE, Schedule of Senior Notes Payable (Details) - USD ($)
1 Months Ended 12 Months Ended
May 03, 2021
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
May 31, 2017
Jul. 31, 2016
Mar. 31, 2012
Debt Instrument [Line Items]                  
Purchase/redemption price     $ 844,000,000 $ 0 $ 0        
Losses on extinguishment of debt     (98,000,000) 0 $ 0        
Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt, gross     2,050,000,000 2,050,000,000          
Unaccreted premiums/(discounts)     5,000,000 10,000,000          
Unamortized debt issuance costs     (18,000,000) (15,000,000)          
Total senior notes payable     2,037,000,000 2,045,000,000          
Losses on extinguishment of debt     98,000,000            
Senior Notes | 4.65% senior notes, due 2030                  
Debt Instrument [Line Items]                  
Long-term debt, gross     500,000,000 500,000,000          
Aggregate principal amount of the notes           $ 500,000,000      
Interest rate           4.65%      
Percentage of principal amount of notes redeemed           100.00%      
Basis spread used in determining redemption price           0.50%      
Senior Notes | 4.95% senior notes, due 2046                  
Debt Instrument [Line Items]                  
Long-term debt, gross     800,000,000 800,000,000          
Aggregate principal amount of the notes             $ 300,000,000 $ 300,000,000  
Interest rate             4.95% 4.95%  
Percentage of principal amount of notes redeemed             100.00%    
Basis spread used in determining redemption price             0.45%    
Senior Notes | 4.95% senior notes, due 2046                  
Debt Instrument [Line Items]                  
Aggregate principal amount of the notes             $ 500,000,000    
Senior Notes | 3.75% senior notes, due 2051                  
Debt Instrument [Line Items]                  
Long-term debt, gross     750,000,000 0          
Aggregate principal amount of the notes   $ 750,000,000              
Interest rate   3.75%              
Percentage of principal amount of notes redeemed   100.00%              
Basis spread used in determining redemption price   0.20%              
Senior Notes | 5.625% senior notes, due 2024                  
Debt Instrument [Line Items]                  
Long-term debt, gross     0 250,000,000          
Interest rate                 5.625%
Senior Notes | 3.625% senior notes, due 2026                  
Debt Instrument [Line Items]                  
Long-term debt, gross     $ 0 $ 500,000,000          
Interest rate               3.625%  
Senior Notes | Existing Notes                  
Debt Instrument [Line Items]                  
Repurchase/redemption amount $ 418,000,000 $ 332,000,000              
Purchase/redemption price $ 473,000,000 $ 373,000,000