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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
 3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Mar. 31, 2023
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
shares
Sep. 30, 2021
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 38,565 $ 35,989 $ 35,581 $ 37,589        
VE territory covered losses incurred (6) (15) (21) (31)        
Recovery through conversion rate adjustment 0 0 1 0        
Ending balance 38,981 35,483 38,981 35,483        
As-converted Value of Preferred Stock 4,451   4,451     $ 3,353    
Book Value of Preferred Stock 1,786   1,786     2,324    
Book Value of Preferred Stock, Total 1,242   1,242     1,272    
Less: right to recover for covered losses (25)   (25)     (35)    
As-converted Value of Preferred Stock, Total recovery for covered losses available 4,426   4,426     3,318    
Book Value of Preferred of Stock, Total recovery for covered losses available $ 1,217   $ 1,217     $ 1,237    
Share price (in dollars per share) | $ / shares $ 237.48   $ 237.48     $ 177.65    
Preferred Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 1,885 2,987 $ 2,324 [1] 3,080        
Recovery through conversion rate adjustment (16) (112) (30) (141)        
Ending balance $ 1,786 [1] $ 2,851 $ 1,786 [1] $ 2,851        
Preferred stock, shares outstanding (in shares) | shares 5 5 5 5 5 5 5 5
Right to Recover for Covered Losses                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ (35) $ (120) $ (35) $ (133)        
VE territory covered losses incurred (6) (15) (21) (31)        
Recovery through conversion rate adjustment 16 112 31 141        
Ending balance (25) (23) (25) (23)        
Series B preferred stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Recovery through conversion rate adjustment     19 135        
As-converted Value of Preferred Stock 1,730   1,730     $ 1,309    
Book Value of Preferred Stock $ 441   $ 441     $ 460    
Preferred stock, shares outstanding (in shares) | shares 2   2     2    
Preferred stock, conversion rate 2.9370   2.9370     2.971    
Series B preferred stock | Preferred Stock                
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)        
Ending balance $ 441 936 441 936        
Series C preferred stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Recovery through conversion rate adjustment     11 6        
As-converted Value of Preferred Stock 2,721   2,721     $ 2,044    
Book Value of Preferred Stock $ 801   $ 801     $ 812    
Preferred stock, shares outstanding (in shares) | shares 3   3     3    
Preferred stock, conversion rate 3.6290   3.6290     3.6450    
Series C preferred stock | Preferred Stock                
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)        
Ending balance $ 801 $ 1,517 $ 801 $ 1,517        
[1] As of June 30, 2023 and September 30, 2022, the book value of series A preferred stock was $544 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