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

3 Months Ended

Mar. 31, 2021

Reserve for Property-Liability Insurance Claims and Claims Expense [Abstract]

Schedule of liability for unpaid claims and claims adjustment expense

Rollforward of the reserve for property and casualty insurance claims and claims expense
	Three months ended March 31,
($ in millions)	2021		2020
Balance as of January 1	$	27,610	$	27,712
Less recoverables (1)	(7,033)		(6,912)
Net balance as of January 1	20,577		20,800
National General acquisition as of January 4, 2021	1,797		—
Incurred claims and claims expense related to:
Current year	6,284		5,333
Prior years	(241)		8
Total incurred	6,043		5,341
Claims and claims expense paid related to:
Current year	(2,541)		(2,352)
Prior years	(3,731)		(3,554)
Total paid	(6,272)		(5,906)
Net balance as of March 31	22,145		20,235
Plus recoverables	9,269		6,913
Balance as of March 31	$	31,414	$	27,148

(1)Recoverables comprises reinsurance and indemnification recoverables.

Prior year reserve reestimates included in claims and claims expense (1)
	Three months ended March 31,
	Non-catastrophe losses				Catastrophe losses				Total
($ in millions)	2021		2020		2021 (2) (3)		2020		2021		2020
Auto	$	(17)	$	22	$	(19)	$	(9)	$	(36)	$	13
Homeowners	5		1		(208)		(8)		(203)		(7)
Other personal lines	—		(2)		(18)		(4)		(18)		(6)
Commercial lines	13		5		2		1		15		6
Run-off Property-Liability	1		2		—		—		1		2
Total prior year reserve reestimates	$	2	$	28	$	(243)	$	(20)	$	(241)	$	8

(1)Favorable reserve reestimates are shown in parentheses.

(2)Includes approximately $150 million of estimated recoveries related to Nationwide Aggregate Reinsurance Program cover for aggregate catastrophe losses occurring between April 1, 2020 and March 31, 2021, which primarily impacted homeowners reestimates.

(3)Includes approximately $110 million favorable subrogation settlements arising from the Woolsey wildfire, which primarily impacted homeowners reestimates.