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U.S. and Europe Retrospective Responsibility Plans - Changes in Preferred Stock and Right to Recover Covered Losses (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 35,581 $ 37,589 $ 36,210  
VE territory covered losses incurred (136) (43) (147)  
Recovery through conversion rate adjustment 1 0 (2)  
Ending Balance 38,733 35,581 37,589  
As-converted Value of Preferred Stock 4,311 3,353    
Book Value of Preferred Stock 1,698 2,324    
Book Value of Preferred Stock, Total 1,242 1,272    
Less: right to recover for covered losses (140) (35)    
As-converted value of Preferred Stock, Total recovery for covered losses available 4,171 3,318    
Book value of Preferred of Stock, Total recovery for covered losses available $ 1,102 1,237    
Share price (in dollars per share) | $ / shares $ 230.01      
Series B        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustment $ 19 135 35  
As-converted Value of Preferred Stock 1,676 1,309    
Book Value of Preferred Stock $ 441 $ 460    
Preferred stock, shares outstanding (in shares) | shares 2 2    
Preferred stock, conversion rate 2.9370 2.9710    
Series C        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Recovery through conversion rate adjustment $ 11 $ 6 20  
As-converted Value of Preferred Stock 2,635 2,044    
Book Value of Preferred Stock $ 801 $ 812    
Preferred stock, shares outstanding (in shares) | shares 3 3    
Preferred stock, conversion rate 3.6290 3.6450    
Class A common stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share price (in dollars per share) | $ / shares $ 230.01 $ 177.65    
Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 2,324 [1],[2] $ 3,080 [1] 5,086  
Recovery through conversion rate adjustment (30) (141) (55)  
Ending Balance $ 1,698 [2] $ 2,324 [1],[2] $ 3,080 [1]  
Preferred stock, shares outstanding (in shares) | shares 5 5 5 5
Preferred Stock | Series B        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 460 $ 1,071    
VE territory covered losses incurred 0 0    
Recovery through conversion rate adjustment (19) (135)    
Sixth Anniversary Release   (476)    
Ending Balance 441 460 $ 1,071  
Preferred Stock | Series C        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 812 1,523    
VE territory covered losses incurred 0 0    
Recovery through conversion rate adjustment (11) (6)    
Sixth Anniversary Release   (705)    
Ending Balance 801 812 1,523  
Right to Recover for Covered Losses        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (35) (133) (39)  
VE territory covered losses incurred (136) (43) (147)  
Recovery through conversion rate adjustment 31 141 53  
Sixth Anniversary Release   0    
Ending Balance $ (140) $ (35) $ (133)  
[1] As of September 30, 2022 and 2021, the book value of series A preferred stock was $1.0 billion and $486 million, respectively. Refer to Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock.
[2] As of September 30, 2023 and 2022, the book value of series A preferred stock was $456 million and $1.0 billion, respectively. Refer to Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock.