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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Liability for claims and claim adjustment expense        
Subrogation benefit   $ 403    
Property-casualty [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development included in estimated claims and claim adjustment expenses incurred for claims arising in prior years     $ 398 $ 108
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations     443 171
Accretion expense     36 36
Property-casualty [Member] | Business Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ (108) (220) 99 (215)
Subrogation benefit   81   81
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to reserves 225 295 225 295
Property-casualty [Member] | 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 22 0 81 (33)
Property-casualty [Member] | Personal Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ 30 362 $ 263 419
Subrogation benefit   $ 322   $ 322