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Goodwill (Roll-forward of Goodwill by Business Segment) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 19,579
Foreign exchange revaluation 475
Balance at end of period 20,237 [1]
goodwill attributable to noncontrolling interests 460
North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 7,168
Foreign exchange revaluation 20
Balance at end of period 7,188 [1]
North American Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 2,218
Foreign exchange revaluation 7
Balance at end of period 2,225 [1]
North America Agricultural Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 134
Foreign exchange revaluation 0
Balance at end of period 134 [1]
Overseas General Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 5,047
Foreign exchange revaluation 306
Balance at end of period 5,536 [1]
Global Reinsurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 371
Foreign exchange revaluation 0
Balance at end of period 371 [1]
Segment Life [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 4,641
Foreign exchange revaluation 142
Balance at end of period 4,783 [1]
LMG Insurance, Thailand [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 183
LMG Insurance, Thailand [Member] | North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 0
LMG Insurance, Thailand [Member] | North American Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 0
LMG Insurance, Thailand [Member] | North America Agricultural Insurance [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 0
LMG Insurance, Thailand [Member] | Overseas General Insurance [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 183
LMG Insurance, Thailand [Member] | Global Reinsurance [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand 0
LMG Insurance, Thailand [Member] | Segment Life [Member]  
Goodwill [Roll Forward]  
Acquisition of Liberty Mutual's P&C insurance business in Thailand $ 0
[1] Includes $460 million attributable to noncontrolling interests.