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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, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance $ 35,989 $ 37,696 $ 37,589 $ 36,210  
VE territory covered losses incurred (15) (21) (31) (38)  
Recovery through conversion rate adjustment 0 (2) 0 (2)  
Ending balance 35,483 37,790 35,483 37,790  
As-converted value of Preferred Stock 7,198   7,198   $ 8,299
Book Value of Preferred Stock, Total 2,453   2,453   2,594
Less: right to recover for covered losses (23)   (23)   (133)
As-converted value of Preferred Stock, Total recovery for covered losses available 7,175   7,175   8,166
Book value of Preferred of Stock, Total recovery for covered losses available $ 2,430   $ 2,430   $ 2,461
Share price (in dollars per share) | $ / shares $ 196.89   $ 196.89   $ 222.75
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance $ 2,987 3,347 $ 3,080 5,086  
Recovery through conversion rate adjustment (112) (40) (141) (55)  
Ending balance 2,851 3,132 2,851 3,132  
Right to Recover for Covered Losses          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance (120) (41) (133) (39)  
VE territory covered losses incurred (15) (21) (31) (38)  
Recovery through conversion rate adjustment 112 38 141 53  
Ending balance (23) (24) (23) (24)  
Series B preferred stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Recovery through conversion rate adjustment     135 35  
As-converted value of Preferred Stock 2,957   2,957   $ 3,493
Book Value of Preferred Stock $ 936   $ 936   $ 1,071
Preferred stock, shares outstanding (in shares) | shares 2   2   2
Preferred stock, conversion rate 6.0550   6.0550   6.3210
Series B preferred stock | Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance     $ 1,071 1,106  
VE territory covered losses incurred     0 0  
Recovery through conversion rate adjustment     (135) (35)  
Ending balance $ 936 1,071 936 1,071  
Series C preferred stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Recovery through conversion rate adjustment     6 20  
As-converted value of Preferred Stock 4,241   4,241   $ 4,806
Book Value of Preferred Stock $ 1,517   $ 1,517   $ 1,523
Preferred stock, shares outstanding (in shares) | shares 3   3   3
Preferred stock, conversion rate 6.8240   6.8240   6.8340
Series C preferred stock | Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance     $ 1,523 1,543  
VE territory covered losses incurred     0 0  
Recovery through conversion rate adjustment     (6) (20)  
Ending balance $ 1,517 $ 1,523 $ 1,517 $ 1,523