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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 6 Months Ended
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
shares
Dec. 31, 2022
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
shares
Sep. 30, 2021
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 36,924 $ 36,194 $ 35,581 $ 37,589        
VE territory covered losses incurred (7) (9) (15) (16)        
Recovery through conversion rate adjustment     1 0        
Ending balance 38,565 35,989 38,565 35,989        
As-converted Value of Preferred Stock 4,240   4,240     $ 3,353    
Book Value of Preferred Stock 1,885   1,885     2,324    
Book Value of Preferred Stock, Total 1,258   1,258     1,272    
Less: right to recover for covered losses (35)   (35)     (35)    
As-converted Value of Preferred Stock, Total recovery for covered losses available 4,205   4,205     3,318    
Book Value of Preferred of Stock, Total recovery for covered losses available $ 1,223   $ 1,223     $ 1,237    
Share price (in dollars per share) | $ / shares $ 225.46   $ 225.46     $ 177.65    
Preferred Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 1,981 2,995 $ 2,324 [1] 3,080        
Recovery through conversion rate adjustment     (14) (29)        
Ending balance $ 1,885 [1] $ 2,987 $ 1,885 [1] $ 2,987        
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 $ (28) $ (111) $ (35) $ (133)        
VE territory covered losses incurred (7) (9) (15) (16)        
Recovery through conversion rate adjustment     15 29        
Ending balance (35) (120) (35) (120)        
Series B preferred stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Recovery through conversion rate adjustment     7 26        
As-converted Value of Preferred Stock 1,654   1,654     $ 1,309    
Book Value of Preferred Stock $ 453   $ 453     $ 460    
Preferred stock, shares outstanding (in shares) | shares 2   2     2    
Preferred stock, conversion rate 2.9580   2.9580     2.9710    
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     (7) (26)        
Ending balance $ 453 1,045 453 1,045        
Series C preferred stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Recovery through conversion rate adjustment     7 3        
As-converted Value of Preferred Stock 2,586   2,586     $ 2,044    
Book Value of Preferred Stock $ 805   $ 805     $ 812    
Preferred stock, shares outstanding (in shares) | shares 3   3     3    
Preferred stock, conversion rate 3.6340   3.6340     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     (7) (3)        
Ending balance $ 805 $ 1,520 $ 805 $ 1,520        
[1] As of March 31, 2023 and September 30, 2022, the book value of series A preferred stock was $627 million and $1.0 billion, respectively. Refer to Note 4—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock