v3.26.3
Goodwill (Roll-forward of Goodwill by Business Segment) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2026
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 20,207
Foreign exchange revaluation 346
Balance at end of period 20,546 [1]
goodwill attributable to noncontrolling interests 440
North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 7,191
Foreign exchange revaluation 0
Balance at end of period 7,191 [1]
North American Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 2,226
Foreign exchange revaluation 0
Balance at end of period 2,226 [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 5,530
Foreign exchange revaluation 117
Balance at end of period 5,640 [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 4,755
Foreign exchange revaluation 229
Balance at end of period 4,984 [1]
LMG Insurance, Thailand [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments (7)
LMG Insurance, Thailand [Member] | North America Commercial P&C Insurance [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments 0
LMG Insurance, Thailand [Member] | North American Personal P&C Insurance [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments 0
LMG Insurance, Thailand [Member] | North America Agricultural Insurance [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments 0
LMG Insurance, Thailand [Member] | Overseas General Insurance [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments (7)
LMG Insurance, Thailand [Member] | Global Reinsurance [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments 0
LMG Insurance, Thailand [Member] | Segment Life [Member]  
Goodwill [Roll Forward]  
Measurement-period adjustments $ 0
[1] Includes $440 million attributable to noncontrolling interests.