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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves $ 212 $ 225 $ 295
Environmental reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 132 89 54
Property-casualty [Member]      
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 537 484 267
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 649 538 351
Accretion expense 46 48 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 381 173 (91)
Subrogation recoveries     81
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 212 225 295
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 222 105 (1)
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 $ 46 $ 260 443
Subrogation recoveries     $ 322