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Insurance Claim Reserves (Details) - Prior Year Reserve Development - Property-casualty [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for claims and claim adjustment expense        
Net favorable prior year reserve development included in estimated claims and claim adjustment expenses incurred for claims arising in prior years     $ 383 $ 398
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations     464 443
Accretion expense     35 36
Business Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ (61) $ (108) 254 99
Business Insurance [Member] | Asbestos reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to reserves 212 225 212 225
Bond & Specialty Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 63 22 171 81
Personal Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ 18 $ 30 $ 39 $ 263