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Reserve for Property and Casualty Insurance Claims and Claims Expense (Tables)
 6 Months Ended
Jun. 30, 2024
Reserve for Property-Liability Insurance Claims and Claims Expense [Abstract]  
Schedule of Rollforward of the Reserve for Property and Casualty Insurance Claims and Claims Expense and Prior Year Reserve Re-Estimates Included in Claims and Claims Expense
Rollforward of the reserve for property and casualty insurance claims and claims expense
Six months ended June 30,
($ in millions)20242023
Balance as of January 1$39,858 $37,541 
Less: Recoverables (1)
8,396 9,176 
Net balance as of January 131,462 28,365 
Incurred claims and claims expense related to:
Current year20,656 21,856 
Prior years(354)197 
Total incurred20,302 22,053 
Claims and claims expense paid related to:
Current year(9,087)(9,094)
Prior years(9,465)(9,523)
Total paid(18,552)(18,617)
Net balance as of June 3033,212 31,801 
Plus: Recoverables
8,341 8,730 
Balance as of June 30$41,553 $40,531 
(1)Recoverables comprises reinsurance and indemnification recoverables.
Prior year reserve reestimates included in claims and claims expense (1)
Non-catastrophe lossesCatastrophe lossesTotal
($ in millions)
202420232024

202320242023
Three months ended June 30,
Auto$(171)$116 $(9)$(19)$(180)$97 
Homeowners(63)41 (128)53 (191)94 
Other personal lines60 8 1 (5)61 3 
Commercial lines109 6 (2)2 107 8 
Other business lines(1)10 — — (1)10 
Run-off Property-Liability
2 1 — — 2 1 
Protection Services(1)(1)— — (1)(1)
Total prior year reserve reestimates$(65)$181 $(138)$31 $(203)$212 
Six months ended June 30,

Auto$(238)$119 $(16)$(47)$(254)$72 
Homeowners(103)29 (277)45 (380)74 
Other personal lines115 18 (2)(12)113 6 
Commercial lines163 29 (5)3 158 32 
Other business lines4 11 — — 4 11 
Run-off Property-Liability
6 3 — — 6 3 
Protection Services(1)(1)— — (1)(1)
Total prior year reserve reestimates
$(54)$208 $(300)$(11)$(354)$197 
(1)Favorable reserve reestimates are shown in parentheses.