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Insurance Claim Reserves (Details) - Prior Year Reserve Development - Property-casualty [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
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 $ 114 $ 294
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 153 317
Accretion expense 12 12
Business Insurance [Member]    
Liability for claims and claim adjustment expense    
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations 113 134
Subrogation benefit   10
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 35 15
Personal Insurance [Member]    
Liability for claims and claim adjustment expense    
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ 5 168
Subrogation benefit   $ 62