Segment Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Segment Information

Segment information is summarized in the following table: 

(In millions)	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Revenues:
Commercial lines insurance
Commercial casualty	$	221		$	197		$	636		$	569
Commercial property	161			138			460			403
Commercial auto	124			108			355			315
Workers' compensation	95			89			270			255
Specialty packages	38			37			114			112
Surety and executive risk	30			28			89			82
Machinery and equipment	11			10			32			29
Commercial lines insurance premiums	680			607			1,956			1,765
Fee revenue	1			—			2			2
Total commercial lines insurance	681			607			1,958			1,767
Personal lines insurance
Personal auto	112			101			328			299
Homeowner	103			90			298			261
Other personal lines	29			28			86			82
Personal lines insurance premiums	244			219			712			642
Fee revenue	—			1			1			2
Total personal lines insurance	244			220			713			644
Excess and surplus lines insurance	30			25			85			68
Life insurance	38			38			124			130
Separate account investment management fees	1			1			3			1
Total life insurance	39			39			127			131
Investment operations
Investment income, net of expenses	133			132			392			395
Realized investment gains, net	22			10			77			29
Total investment revenue	155			142			469			424
Other	3			2			7			7
Total revenues	$	1,152		$	1,035		$	3,359		$	3,041
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	43		$	60		$	135		$	74
Personal lines insurance	14			(12		)	33			(89		)
Excess and surplus lines insurance	4			(3		)	5			(8		)
Life insurance	—			—			10			(2		)
Investment operations	134			121			409			362
Other	(13		)	(14		)	(45		)	(44		)
Total	$	182		$	152		$	547		$	293

Identifiable assets:	September 30, 2013		December 31, 2012
Property casualty insurance	$	2,479	$	2,395
Life insurance	1,263		1,201
Investment operations	13,137		12,599
Other	460		353
Total	$	17,339	$	16,548