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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for claims and claim adjustment expense      
Subrogation recoveries $ 403    
Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 295 $ 220 $ 225
Environmental reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 54 76 55
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 267 (164) 406
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 351 (60) 517
Accretion expense 49 49 49
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 (91) (258) 142
Subrogation recoveries 81    
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 295 220 225
Property-casualty [Member] | Business Insurance [Member] | Environmental reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves   76 55
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 (1) 65 266
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 443 $ 133 $ 109
Subrogation recoveries $ 322