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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves $ 225 $ 295 $ 220
Environmental reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 89 54 76
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 484 267 (164)
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 538 351 (60)
Accretion expense 48 49 49
Subrogation recoveries   403  
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 173 (91) (258)
Subrogation recoveries   81  
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 225 295 220
Property-casualty [Member] | Business Insurance [Member] | Environmental reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves     76
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 105 (1) 65
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 $ 260 443 $ 133
Subrogation recoveries   $ 322