Reserve for Property and Casualty Insurance Claims and Claims Expense (Tables)

3 Months Ended

Mar. 31, 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
	Three months ended March 31,
($ in millions)	2024		2023
Balance as of January 1	$	39,858	$	37,541
Less: Recoverables (1)	8,396		9,176
Net balance as of January 1	31,462		28,365
Incurred claims and claims expense related to:
Current year	9,652		10,341
Prior years	(151)		(15)
Total incurred	9,501		10,326
Claims and claims expense paid related to:
Current year	(3,163)		(3,122)
Prior years	(5,990)		(6,036)
Total paid	(9,153)		(9,158)
Net balance as of March 31	31,810		29,533
Plus: Recoverables	8,333		9,111
Balance as of March 31	$	40,143	$	38,644

(1)Recoverables comprises reinsurance and indemnification recoverables.

Prior year reserve reestimates included in claims and claims expense (1)
	Non-catastrophe losses				Catastrophe losses				Total
($ in millions)	2024		2023		2024		2023		2024		2023
Three months ended March 31,
Auto	$	(67)	$	3	$	(7)	$	(28)	$	(74)	$	(25)
Homeowners	(40)		(12)		(149)		(8)		(189)		(20)
Other personal lines	55		10		(3)		(7)		52		3
Commercial lines	54		23		(3)		1		51		24
Other business lines	5		1		—		—		5		1
Run-off Property-Liability	4		2		—		—		4		2
Total prior year reserve reestimates	$	11	$	27	$	(162)	$	(42)	$	(151)	$	(15)

(1)Favorable reserve reestimates are shown in parentheses.