Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Segment Information

Segment information is summarized in the following table:

(Dollars in millions)	Years ended December 31,
	2023		2022		2021
Revenues:
Commercial lines insurance
Commercial casualty	$	1,481	$	1,416	$	1,270
Commercial property	1,264		1,136		1,043
Commercial auto	862		842		794
Workers' compensation	277		284		268
Other commercial	380		346		299
Commercial lines insurance premiums	4,264		4,024		3,674
Fee revenues	4		4		4
Total commercial lines insurance	4,268		4,028		3,678
Personal lines insurance
Personal auto	721		626		609
Homeowner	1,044		829		726
Other personal	279		234		207
Personal lines insurance premiums	2,044		1,689		1,542
Fee revenues	4		4		4
Total personal lines insurance	2,048		1,693		1,546
Excess and surplus lines insurance	542		485		398
Fee revenues	3		2		2
Total excess and surplus lines insurance	545		487		400
Life insurance premiums	313		301		294
Fee revenues	10		4		5
Total life insurance	323		305		299
Investments
Investment income, net of expenses	894		781		714
Investment gains and losses, net	1,127		(1,467)		2,409
Total investment revenue	2,021		(686)		3,123
Other
Premiums	795		726		570
Other	13		10		10
Total other revenue	808		736		580
Total revenues	$	10,013	$	6,563	$	9,626
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	168	$	38	$	598
Personal lines insurance	(4)		18		97
Excess and surplus lines insurance	54		48		44
Life insurance	41		27		12
Investments	1,900		(795)		3,018
Other	117		(30)		(71)
Total income (loss) before income taxes	$	2,276	$	(694)	$	3,698
	December 31,		December 31,
Identifiable assets:	2023		2022
Property casualty insurance	$	5,294	$	5,178
Life insurance	1,562		1,518
Investments	24,999		22,133
Other	914		903
Total	$	32,769	$	29,732