Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Segment Information

This table summarizes segment information:

(In millions)	Years ended December 31,
	2013			2012			2011
Revenues:
Commercial lines insurance
Commercial casualty	$	856		$	767		$	711
Commercial property	623			545			497
Commercial auto	479			426			394
Workers' compensation	365			344			318
Specialty packages	150			151			138
Management liability and surety	119			111			103
Machinery and equipment	44			39			36
Commercial lines insurance premiums	2,636			2,383			2,197
Fee revenue	3			4			3
Total commercial lines insurance	2,639			2,387			2,200
Personal lines insurance
Personal auto	443			404			368
Homeowner	403			353			294
Other personal lines	115			111			100
Personal lines insurance premiums	961			868			762
Fee revenue	1			2			1
Total personal lines insurance	962			870			763
Excess and surplus lines insurance	116			93			70
Life insurance premiums	189			178			165
Separate account investment management fees	4			1			2
Total life insurance	193			179			167
Investment operations
Investment income, net of expenses	529			531			525
Realized investment gains, net	83			42			70
Total investment revenue	612			573			595
Other	9			9			8
Total revenues	$	4,531		$	4,111		$	3,803
Income (loss) before income taxes:
Insurance underwriting results:
Commercial lines insurance	$	186		$	181		$	(102	)
Personal lines insurance	33			(43		)	(182		)
Excess and surplus lines insurance	14			(1		)	6
Life insurance	9			(3		)	(3		)
Investment operations	532			491			514
Other	(60		)	(59		)	(60		)
Total income before income taxes	$	714		$	566		$	173
Identifiable assets:	December 31,			December 31,
	2013			2012
Property casualty insurance	$	2,455		$	2,395
Life insurance	1,225			1,201
Investment operations	13,618			12,599
Other	364			353
Total	$	17,662		$	16,548