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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, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     $ 34,684 $ 34,006 $ 32,760
VE territory covered losses incurred     (37) (172) (11)
Recovery through conversion rate adjustment     (5)    
Ending Balance $ 36,210 $ 34,684 36,210 34,684 34,006
Preferred Stock Available to Recover Covered Losses, Value, As-converted 7,499 13,058 7,499 13,058  
Preferred Stock Available to Recover Covered Losses, Value 2,649 5,462 2,649 5,462  
Right to recover for covered losses (39) (171) (39) (171)  
Preferred Stock Available to Recover Covered Losses, Value, As-converted, Net 7,460 12,887 7,460 12,887  
Preferred Stock Available to Recover Covered Losses, Value, Net $ 2,610 $ 5,291 $ 2,610 $ 5,291  
Share price (in dollars per share) | $ / shares $ 199.97   $ 199.97    
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Preferred stock, shares outstanding (in shares) | shares 5 5 5 5  
Series B Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Recovery through conversion rate adjustment     $ (72) $ (6) (35)
Preferred Stock Available to Recover Covered Losses, Value, As-converted $ 3,168 $ 5,519 3,168 5,519  
Preferred stock $ 1,106 $ 2,285 $ 1,106 $ 2,285  
Preferred stock, shares outstanding (in shares) | shares 2 2 2 2  
Preferred stock, conversion rate 6.3870 12.9360      
Series C Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Recovery through conversion rate adjustment     $ (92) $ (2) (21)
Preferred Stock Available to Recover Covered Losses, Value, As-converted $ 4,331 $ 7,539 4,331 7,539  
Preferred stock $ 1,543 $ 3,177 $ 1,543 $ 3,177  
Preferred stock, shares outstanding (in shares) | shares 3 3 3 3  
Preferred stock, conversion rate 6.861 13.8840      
Class A common stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share price (in dollars per share) | $ / shares $ 199.97 $ 172.01 $ 199.97 $ 172.01  
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     $ 5,462 $ 5,470 5,526
Recovery through conversion rate adjustment     164 8 56
Ending Balance $ 5,086 $ 5,462 5,086 5,462 5,470
Preferred Stock | Series B Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     2,285    
VE territory covered losses incurred     0    
Recovery through conversion rate adjustment     (72)    
Fourth anniversary release     (1,107)    
Ending Balance 1,106 2,285 1,106 2,285  
Preferred Stock | Series C Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     3,177    
VE territory covered losses incurred     0    
Recovery through conversion rate adjustment     (92)    
Fourth anniversary release     (1,542)    
Ending Balance 1,543 3,177 1,543 3,177  
Right to Recover for Covered Losses          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     (171) (7) (52)
VE territory covered losses incurred     (37) (172) (11)
Recovery through conversion rate adjustment     (169) (8) (56)
Fourth anniversary release     0    
Ending Balance $ (39) $ (171) $ (39) $ (171) $ (7)