Segment Information (tables)

6 Months Ended

Jun. 30, 2017

Company's revenues and income by segment [Table Text Block]

(for the three months ended June 30, in millions)	Business Insurance		Bond & Specialty Insurance		Personal Insurance		Total Reportable Segments
2017
Premiums	$	3,504	$	575	$	2,272	$	6,351
Net investment income	447		56		95		598
Fee income	112		—		4		116
Other revenues	15		6		15		36
Total segment revenues (1)	$	4,078	$	637	$	2,386	$	7,101
Segment income (1)	$	429	$	163	$	12	$	604

2016
Premiums	$	3,439	$	559	$	2,069	$	6,067
Net investment income	404		58		87		549
Fee income	115		—		4		119
Other revenues	8		5		15		28
Total segment revenues (1)	$	3,966	$	622	$	2,175	$	6,763
Segment income (1)	$	401	$	215	$	95	$	711

(1) Segment revenues for reportable business segments exclude net realized investment gains (losses). Segment income for reportable business segments equals net income excluding the after-tax impact of net realized investment gains (losses).

(for the six months ended June 30, in millions)	Business Insurance		Bond & Specialty Insurance		Personal Insurance		Total Reportable Segments
2017
Premiums	$	6,933	$	1,130	$	4,471	$	12,534
Net investment income	900		117		191		1,208
Fee income	221		—		8		229
Other revenues	24		11		31		66
Total segment revenues (1)	$	8,078	$	1,258	$	4,701	$	14,037
Segment income (1)	$	871	$	308	$	101	$	1,280

2016
Premiums	$	6,853	$	1,111	$	4,084	$	12,048
Net investment income	803		118		172		1,093
Fee income	229		—		7		236
Other revenues	38		9		31		78
Total segment revenues (1)	$	7,923	$	1,238	$	4,294	$	13,455
Segment income (1)	$	848	$	375	$	247	$	1,470

Business segment reconciliations of revenue and income, net of tax [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2017			2016			2017			2016
Revenue reconciliation
Earned premiums
Business Insurance:
Domestic:
Workers’ compensation	$	999		$	987		$	1,975		$	1,968
Commercial automobile	521			503			1,027			994
Commercial property	443			442			878			879
General liability	498			485			989			967
Commercial multi-peril	797			786			1,571			1,568
Other	7			9			14			14
Total Domestic	3,265			3,212			6,454			6,390
International	239			227			479			463
Total Business Insurance	3,504			3,439			6,933			6,853

Bond & Specialty Insurance:
Domestic:
Fidelity and surety	245			239			479			469
General liability	239			235			474			469
Other	46			44			91			88
Total Domestic	530			518			1,044			1,026
International	45			41			86			85
Total Bond & Specialty Insurance	575			559			1,130			1,111

Personal Insurance:
Domestic:
Automobile	1,145			974			2,239			1,910
Homeowners and Other	977			944			1,932			1,882
Total Domestic	2,122			1,918			4,171			3,792
International	150			151			300			292
Total Personal Insurance	2,272			2,069			4,471			4,084
Total earned premiums	6,351			6,067			12,534			12,048
Net investment income	598			549			1,208			1,093
Fee income	116			119			229			236
Other revenues	36			28			66			78
Total segment revenues	7,101			6,763			14,037			13,455
Other revenues	3			3			4			6
Net realized investment gains	80			19			85			10
Total revenues	$	7,184		$	6,785		$	14,126		$	13,471

Income reconciliation, net of tax
Total segment income	$	604		$	711		$	1,280		$	1,470
Interest Expense and Other (1)	(61		)	(62		)	(123		)	(123		)
Core income	543			649			1,157			1,347
Net realized investment gains	52			15			55			8
Net income	$	595		$	664		$	1,212		$	1,355

(1) The primary component of Interest Expense and Other was after-tax interest expense of $60 million in each of the three months ended June 30, 2017 and 2016, and $118 million and $120 million in the six months ended June 30, 2017 and 2016, respectively.

Asset reconciliation [Table Text Block]

(in millions)	June 30, 2017		December 31, 2016
Asset reconciliation
Business Insurance	$	77,653	$	75,730
Bond & Specialty Insurance	8,998		8,726
Personal Insurance	15,666		15,426
Total segment assets	102,317		99,882
Other assets (1)	352		363
Total consolidated assets	$	102,669	$	100,245

(1) The primary components of other assets at June 30, 2017 and December 31, 2016 were other intangible assets and deferred taxes.