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Goodwill and Value of business acquired (Roll-forward of Goodwill by Business Segment) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 16,228
Goodwill, Acquired During Period 3,394 [1]
Foreign exchange revaluation and other (68)
Balance at end of period 19,554
goodwill attributable to noncontrolling interests 1,000
North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 6,945
Foreign exchange revaluation and other 0
Balance at end of period 6,945
North America Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 2,230
Foreign exchange revaluation and other 0
Balance at end of period 2,230
North America Agricultural Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 134
Foreign exchange revaluation and other 0
Balance at end of period 134
Overseas General Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 4,605
Foreign exchange revaluation and other 44
Balance at end of period 5,211
Global Reinsurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 371
Foreign exchange revaluation and other 0
Balance at end of period 371
Segment Life [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 1,943
Foreign exchange revaluation and other (112)
Balance at end of period 4,663
Huatai Group | North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period 0 [1]
Huatai Group | North America Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period 0 [1]
Huatai Group | North America Agricultural Insurance [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period 0 [1]
Huatai Group | Overseas General Insurance [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period 562 [1]
Huatai Group | Global Reinsurance [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period 0 [1]
Huatai Group | Segment Life [Member]  
Goodwill [Roll Forward]  
Goodwill, Acquired During Period $ 2,832 [1]
[1] $1.0 billion attributable to noncontrolling interests.