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Reserve for Property and Casualty Insurance Claims and Claims Expense (Tables)
 9 Months Ended
Sep. 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
Nine months ended September 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 year31,033 31,910 
Prior years(322)380 
Total incurred30,711 32,290 
Claims and claims expense paid related to:
Current year(15,977)(16,593)
Prior years(12,181)(12,057)
Total paid(28,158)(28,650)
Net balance as of September 3034,015 32,005 
Plus: Recoverables
8,728 8,654 
Balance as of September 30$42,743 $40,659 
(1)Recoverables comprises reinsurance and indemnification recoverables.
Prior year reserve reestimates included in claims and claims expense (1)
Non-catastrophe lossesCatastrophe lossesTotal
($ in millions)
202420232024

202320242023
Three months ended September 30,
Auto$(55)$27 $(10)$6 $(65)$33 
Homeowners(11)46 (1)16 (12)62 
Other personal lines54 (3)(3)(11)51 (14)
Commercial lines1 13 — 6 1 19 
Other business lines(3)1 — — (3)1 
Run-off Property-Liability
59 82 — — 59 82 
Protection Services1 — — — 1 — 
Total prior year reserve reestimates$46 $166 $(14)$17 $32 $183 
Nine months ended September 30,

Auto$(293)$146 $(26)$(41)$(319)$105 
Homeowners(114)75 (278)61 (392)136 
Other personal lines169 15 (5)(23)164 (8)
Commercial lines164 42 (5)9 159 51 
Other business lines1 12 — — 1 12 
Run-off Property-Liability
65 85 — — 65 85 
Protection Services— (1)— — — (1)
Total prior year reserve reestimates
$(8)$374 $(314)$6 $(322)$380 
(1)Favorable reserve reestimates are shown in parentheses.