Segment Information (Tables)

12 Months Ended

Dec. 31, 2022

Segment Reporting [Abstract]

Segment Information

Segment information is summarized in the following table:

(Dollars in millions)	Years ended December 31,
	2022		2021		2020
Revenues:
Commercial lines insurance
Commercial casualty	$	1,416	$	1,270	$	1,165
Commercial property	1,136		1,043		1,010
Commercial auto	842		794		755
Workers' compensation	284		268		271
Other commercial	346		299		275
Commercial lines insurance premiums	4,024		3,674		3,476
Fee revenues	4		4		3
Total commercial lines insurance	4,028		3,678		3,479
Personal lines insurance
Personal auto	626		609		615
Homeowner	829		726		658
Other personal	234		207		190
Personal lines insurance premiums	1,689		1,542		1,463
Fee revenues	4		4		4
Total personal lines insurance	1,693		1,546		1,467
Excess and surplus lines insurance	485		398		325
Fee revenues	2		2		2
Total excess and surplus lines insurance	487		400		327
Life insurance premiums	295		298		289
Fee revenues	4		5		2
Total life insurance	299		303		291
Investments
Investment income, net of expenses	781		714		670
Investment gains and losses, net	(1,467)		2,409		865
Total investment revenue	(686)		3,123		1,535
Other
Premiums	726		570		427
Other	10		10		10
Total other revenue	736		580		437
Total revenues	$	6,557	$	9,630	$	7,536
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	38	$	598	$	64
Personal lines insurance	18		97		47
Excess and surplus lines insurance	48		44		34
Life insurance	28		(16)		11
Investments	(795)		3,018		1,433
Other	(30)		(71)		(90)
Total income (loss) before income taxes	$	(693)	$	3,670	$	1,499
	December 31,		December 31,
Identifiable assets:	2022		2021
Property casualty insurance	$	5,178	$	4,421
Life insurance	1,522		1,590
Investments	22,133		24,481
Other	903		895
Total	$	29,736	$	31,387