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U.S. and Europe Retrospective Responsibility Plans - Schedule of Changes in Preferred Stock and Right to Recover Covered Losses (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 37,909 [1] $ 39,137    
VE territory covered losses (3) (27)    
Recovery through conversion rate adjustments (1) 0    
Balance as of end of period 38,777 38,296    
As-converted Value of Preferred Stock 1,312   $ 1,389  
Book value of preferred stock 551   745  
Book Value of Preferred Stock, Total 123   232  
Less: right to recover for covered losses (19)   (124)  
As-converted Value of Preferred Stock, Total recovery for covered losses available 1,293   1,265  
Book Value of Preferred of Stock, Total recovery for covered losses available $ 104   $ 108  
Preferred stock, shares outstanding (in shares) | shares 5   5  
Share price (in dollars per share) | $ / shares $ 350.71   $ 341.38  
Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 745 [1] 1,031 [2]    
Recovery through conversion rate adjustments (109) (8)    
Balance as of end of period $ 551 [1] $ 904 [2]    
Preferred stock, shares outstanding (in shares) | shares 5 5 5 5
Right to Recover for Covered Losses        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ (124) [1] $ (104)    
VE territory covered losses (3) (27)    
Recovery through conversion rate adjustments 108 8    
Balance as of end of period (19) (123)    
Series B preferred stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustments 60 5    
As-converted Value of Preferred Stock 518   $ 566  
Book value of preferred stock $ 7   $ 67  
Preferred stock, shares outstanding (in shares) | shares 2   2  
Preferred stock, conversion rate (in percent) 0.5960   0.6690  
Series B preferred stock | Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 67 104    
VE territory covered losses 0 0    
Recovery through conversion rate adjustments (60) (5)    
Balance as of end of period 7 99    
Series C preferred stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustments 49 3    
As-converted Value of Preferred Stock 794   $ 823  
Book value of preferred stock $ 116   $ 165  
Preferred stock, shares outstanding (in shares) | shares 3   3  
Preferred stock, conversion rate (in percent) 0.7170   0.7640  
Series C preferred stock | Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 165 387    
VE territory covered losses 0 0    
Recovery through conversion rate adjustments (49) (3)    
Balance as of end of period $ 116 $ 384    
[1] As of December 31, 2025 and September 30, 2025, the book value of series A convertible participating preferred stock (series A preferred stock) was $428 million and $513 million, respectively. See Note 4—U.S. and Europe Retrospective Responsibility Plans for the book value of series B convertible participating preferred stock (series B preferred stock) and series C convertible participating preferred stock (series C preferred stock).
[2] As of December 31, 2024 and September 30, 2024, the book value of series A preferred stock was $421 million and $540 million, respectively. See Note 4—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock.