Segment Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

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

(For the three months ended March 31, in millions)	Business Insurance		Bond & Specialty Insurance		Personal Insurance		Total Reportable Segments
2019
Premiums	$	3,742	$	606	$	2,507	$	6,855
Net investment income	427		56		99		582
Fee income	104		—		5		109
Other revenues	43		6		22		71
Total segment revenues (1)	$	4,316	$	668	$	2,633	$	7,617
Segment income (1)	$	414	$	138	$	278	$	830
2018
Premiums	$	3,568	$	582	$	2,387	$	6,537
Net investment income	446		58		99		603
Fee income	99		—		4		103
Other revenues	31		6		17		54
Total segment revenues (1)	$	4,144	$	646	$	2,507	$	7,297
Segment income (1)	$	452	$	173	$	129	$	754

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(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).

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

	Three Months Ended March 31,
(in millions)	2019			2018
Revenue reconciliation
Earned premiums
Business Insurance:
Domestic:
Workers’ compensation	$	972		$	971
Commercial automobile	628			562
Commercial property	460			438
General liability	567			521
Commercial multi-peril	840			805
Other	8			7
Total Domestic	3,475			3,304
International	267			264
Total Business Insurance	3,742			3,568
Bond & Specialty Insurance:
Domestic:
Fidelity and surety	246			246
General liability	257			242
Other	52			47
Total Domestic	555			535
International	51			47
Total Bond & Specialty Insurance	606			582
Personal Insurance:
Domestic:
Automobile	1,297			1,225
Homeowners and Other	1,039			995
Total Domestic	2,336			2,220
International	171			167
Total Personal Insurance	2,507			2,387
Total earned premiums	6,855			6,537
Net investment income	582			603
Fee income	109			103
Other revenues	71			54
Total segment revenues	7,617			7,297
Other revenues	1			—
Net realized investment gains (losses)	53			(11		)
Total revenues	$	7,671		$	7,286
Income reconciliation, net of tax
Total segment income	$	830		$	754
Interest Expense and Other (1)	(75		)	(76		)
Core income	755			678
Net realized investment gains (losses)	41			(9		)
Net income	$	796		$	669

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(1) The primary component of Interest Expense and Other was after-tax interest expense of $70 million for both the three months ended March 31, 2019 and 2018.

Asset reconciliation [Table Text Block]

(in millions)	March 31, 2019		December 31, 2018
Asset reconciliation
Business Insurance	$	82,022	$	78,965
Bond & Specialty Insurance	8,363		8,693
Personal Insurance	16,288		15,943
Total assets by reportable segment	106,673		103,601
Other assets (1)	573		632
Total consolidated assets	$	107,246	$	104,233

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(1) The primary components of other assets at both March 31, 2019 and December 31, 2018 were accrued over-funded benefit plan assets related to the Company’s qualified domestic pension plan and other intangible assets.