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Insurance Claim Reserves (Details) - Prior Year Reserve Development - Property-casualty [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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     $ (214) $ 255
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations     (120) 350
Accretion expense     37 37
Business Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ (316) $ (56) (266) 94
Business Insurance [Member] | Asbestos reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to asbestos and environmental reserves 220 225 220 225
Business Insurance [Member] | Environmental reserves [Member]        
Liability for claims and claim adjustment expense        
Increase to asbestos and environmental reserves     68 55
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 3 53 45 177
Personal Insurance [Member]        
Liability for claims and claim adjustment expense        
Net favorable (unfavorable) prior year reserve development impacting the Company's results of operations $ 19 $ 17 $ 101 $ 79