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Insurance Claim Reserves (Details) - Prior Year Reserve Development - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves $ 242 $ 284 $ 212
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 548 38 537
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 709 143 649
Accretion expense 44 45 46
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 90 (289) 381
Property-casualty [Member] | Business Insurance [Member] | Asbestos reserves [Member]      
Liability for claims and claim adjustment expense      
Increase to reserves 242 284 212
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 129 285 222
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 $ 490 $ 147 $ 46