Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Segment Information

Segment information is summarized in the following table:

(Dollars in millions)	Years ended December 31,
	2019			2018			2017
Revenues:
Commercial lines insurance
Commercial casualty	$	1,102		$	1,075		$	1,072
Commercial property	958			920			903
Commercial auto	707			664			634
Workers' compensation	300			324			335
Other commercial	252			235			221
Commercial lines insurance premiums	3,319			3,218			3,165
Fee revenues	5			5			5
Total commercial lines insurance	3,324			3,223			3,170
Personal lines insurance
Personal auto	621			614			582
Homeowner	607			563			518
Other personal	176			159			141
Personal lines insurance premiums	1,404			1,336			1,241
Fee revenues	4			5			5
Total personal lines insurance	1,408			1,341			1,246
Excess and surplus lines insurance	278			234			209
Fee revenues	2			1			1
Total excess and surplus lines insurance	280			235			210
Life insurance premiums	270			250			232
Fee revenues	4			4			5
Total life insurance	274			254			237
Investments
Investment income, net of expenses	646			619			609
Investment gains and losses, net	1,650			(402		)	148
Total investment revenue	2,296			217			757
Other
Premiums	333			132			107
Other	9			5			5
Total other revenue	342			137			112
Total revenues	$	7,924		$	5,407		$	5,732
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	241		$	151		$	119
Personal lines insurance	8			(20		)	(32		)
Excess and surplus lines insurance	53			63			61
Life insurance	1			8			(1		)
Investments	2,197			121			664
Other	(28		)	(72		)	(81		)
Total income before income taxes	$	2,472		$	251		$	730
	December 31,			December 31,
Identifiable assets:	2019			2018
Property casualty insurance	$	3,437		$	3,285
Life insurance	1,516			1,424
Investments	19,583			16,741
Other	872			485
Total	$	25,408		$	21,935