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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Incurred claim and claim adjustment expenses related to current year $ 5,667 $ 5,181 $ 5,021
Incurred claim and claim adjustment expenses related to prior years 48 (32) 15
Consolidated Property and Casualty Insurance Entity      
Deferred acquisition costs   806  
Reserves for unpaid claim and claim adjustment expenses 23,304 22,120  
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.4%) 647 683  
Unearned premiums 6,933 6,374  
Net written premiums 9,892 9,128 8,405
Net earned premiums 9,480 8,667 8,175
Net investment income 2,163 1,751 2,111
Incurred claim and claim adjustment expenses related to current year   5,181 5,021
Incurred claim and claim adjustment expenses related to prior years   (32) 15
Amortization of deferred acquisition costs 1,644 1,490 1,443
Paid claim and claim adjustment expenses $ 4,601 $ 4,302 $ 3,949
Consolidated Property and Casualty Insurance Entity | Minimum      
Supplemental Information Parenthetical      
SEC Schedule, 12-18, supplemental information, property-casualty insurance underwriters, interest rate at which discount computed 3.50% 3.50%  
Consolidated Property and Casualty Insurance Entity | Maximum      
Supplemental Information Parenthetical      
SEC Schedule, 12-18, supplemental information, property-casualty insurance underwriters, interest rate at which discount computed 6.40% 6.40%