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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Liability for claims and claim adjustment expense        
Subrogation recoveries $ 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     $ 108 $ (214)
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations     171 (120)
Accretion expense     36 37
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 (220) $ (316) (215) (266)
Subrogation recoveries 81   81  
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to reserves 295 220 295 220
Property-casualty [Member] | Business Insurance [Member] | Environmental reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to reserves       68
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 0 3 (33) 45
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 362 $ 19 419 $ 101
Subrogation recoveries $ 322   $ 322