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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, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 39,137 $ 38,733    
VE territory covered losses incurred (27) (24)    
Recovery through conversion rate adjustment 0 0    
Balance as of end of period 38,296 39,733    
As-converted Value of Preferred Stock 2,560   $ 2,234  
Book Value of Preferred Stock 904   1,031  
Book Value of Preferred Stock, Total 483   491  
Less: right to recover for covered losses (123)   (104)  
As-converted Value of Preferred Stock, Total recovery for covered losses available 2,437   2,130  
Book Value of Preferred of Stock, Total recovery for covered losses available $ 360   $ 387  
Preferred stock, shares outstanding (in shares) | shares 5   5  
Share price (in dollars per share) | $ / shares $ 316.04   $ 274.95  
Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 1,031 [1] 1,698 [2]    
Recovery through conversion rate adjustment (8) (25)    
Balance as of end of period $ 904 [1] $ 1,615 [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 $ (104) $ (140)    
VE territory covered losses incurred (27) (24)    
Recovery through conversion rate adjustment 8 25    
Balance as of end of period (123) (139)    
Series B preferred stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustment 5 22    
As-converted Value of Preferred Stock 781   $ 684  
Book Value of Preferred Stock $ 99   $ 104  
Preferred stock, shares outstanding (in shares) | shares 2   2  
Preferred stock, conversion rate 0.9960   1.0030  
Series B preferred stock | Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 104 441    
VE territory covered losses incurred 0 0    
Recovery through conversion rate adjustment (5) (22)    
Balance as of end of period 99 419    
Series C preferred stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustment 3 3    
As-converted Value of Preferred Stock 1,779   $ 1,550  
Book Value of Preferred Stock $ 384   $ 387  
Preferred stock, shares outstanding (in shares) | shares 3   3  
Preferred stock, conversion rate 1.7830   1.7860  
Series C preferred stock | Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance as of beginning of period $ 387 801    
VE territory covered losses incurred 0 0    
Recovery through conversion rate adjustment (3) (3)    
Balance as of end of period $ 384 $ 798    
[1] As of December 31, 2024 and September 30, 2024, the book value of series A convertible participating preferred stock (series A preferred stock) was $421 million and $540 million, respectively. See Note 5—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, 2023 and September 30, 2023, the book value of series A preferred stock was $398 million and $456 million, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock.