Segment Information (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Segment Information

This table summarizes segment information:

(Dollars in millions)	Years ended December 31,
	2014			2013			2012
Revenues:
Commercial lines insurance
Commercial casualty	$	938		$	856		$	767
Commercial property	728			623			545
Commercial auto	528			479			426
Workers' compensation	370			365			344
Other commercial lines	292			313			301
Commercial lines insurance premiums	2,856			2,636			2,383
Fee revenues	4			3			4
Total commercial lines insurance	2,860			2,639			2,387
Personal lines insurance
Personal auto	476			443			404
Homeowner	443			403			353
Other personal lines	122			115			111
Personal lines insurance premiums	1,041			961			868
Fee revenues	2			1			2
Total personal lines insurance	1,043			962			870
Excess and surplus lines insurance	148			116			93
Life insurance premiums	198			189			178
Separate account investment management fees	6			4			1
Total life insurance	204			193			179
Investments
Investment income, net of expenses	549			529			531
Realized investment gains, net	133			83			42
Total investment revenue	682			612			573
Other	8			9			9
Total revenues	$	4,945		$	4,531		$	4,111
Income (loss) before income taxes:
Insurance underwriting results:
Commercial lines insurance	$	146		$	186		$	181
Personal lines insurance	10			33			(43		)
Excess and surplus lines insurance	30			14			(1		)
Life insurance	(5		)	9			(3		)
Investments	599			532			491
Other	(59		)	(60		)	(59		)
Total income before income taxes	$	721		$	714		$	566
	December 31,			December 31,
Identifiable assets:	2014			2013
Property casualty insurance	$	2,656		$	2,455
Life insurance	1,316			1,225
Investments	14,441			13,618
Other	340			364
Total	$	18,753		$	17,662