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Segment Information
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
Nature of Operations
 
The Company’s results are reported in the following three business segments — Business Insurance, Bond & Specialty Insurance and Personal Insurance. These segments reflect the manner in which the Company’s businesses are currently managed and represent an aggregation of products and services based on the type of customer, how the business is marketed and the manner in which risks are underwritten. For more information regarding the Company’s nature of operations, see the “Nature of Operations” section of note 1 of notes to the consolidated financial statements in the Company’s 2020 Annual Report.
The following tables summarize the components of the Company’s revenues, income and total assets by reportable business segments:
(For the three months ended March 31, in millions) Business
Insurance		Bond & Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2021    
Premiums$3,799 $743 $2,844 $7,386 
Net investment income523 59 119 701 
Fee income95 — 6 101 
Other revenues53 5 23 81 
Total segment revenues (1)
$4,470 $807 $2,992 $8,269 
Segment income (1)
$317 $137 $314 $768 
2020    
Premiums$3,864 $667 $2,698 $7,229 
Net investment income453 55 103 611 
Fee income102 — 6 108 
Other revenues31 5 22 58 
Total segment revenues (1)
$4,450 $727 $2,829 $8,006 
Segment income (1)
$289 $122 $336 $747 
_________________________________________________________
(1)Segment revenues for reportable business segments exclude net realized investment gains (losses) and revenues included in "interest expense and other." Segment income for reportable business segments equals net income excluding the after-tax impact of net realized investment gains (losses) and income (loss) from "interest expense and other."
Business Segment Reconciliations
 Three Months Ended
March 31,
(in millions)20212020
Revenue reconciliation  
Earned premiums  
Business Insurance:  
Domestic:  
Workers’ compensation$811 $899 
Commercial automobile695 684 
Commercial property531 508 
General liability607 601 
Commercial multi-peril870 886 
Other14 12 
Total Domestic3,528 3,590 
International271 274 
Total Business Insurance3,799 3,864 
Bond & Specialty Insurance:  
Domestic:  
Fidelity and surety266 257 
General liability331 287 
Other56 58 
Total Domestic653 602 
International90 65 
Total Bond & Specialty Insurance743 667 
Personal Insurance:  
Domestic:  
Automobile1,370 1,351 
Homeowners and Other1,308 1,176 
Total Domestic2,678 2,527 
International166 171 
Total Personal Insurance2,844 2,698 
Total earned premiums7,386 7,229 
Net investment income701 611 
Fee income101 108 
Other revenues81 58 
Total segment revenues8,269 8,006 
Other revenues— — 
Net realized investment gains (losses)44 (98)
Total revenues$8,313 $7,908 
Income reconciliation, net of tax  
Total segment income$768 $747 
Interest Expense and Other (1)
(69)(71)
Core income699 676 
Net realized investment gains (losses)34 (76)
Net income$733 $600 
_________________________________________________________
(1) The primary component of Interest Expense and Other was after-tax interest expense of $65 million and $66 million for the three months ended March 31, 2021 and 2020, respectively.
(in millions)March 31,
2021		December 31,
2020
Asset reconciliation  
Business Insurance$88,657 $88,422 
Bond & Specialty Insurance9,488 9,420 
Personal Insurance18,279 18,328 
Total assets by reportable segment116,424 116,170 
Other assets (1)
608 594 
Total consolidated assets$117,032 $116,764 
 _________________________________________________________
(1)The primary components of other assets at both March 31, 2021 and December 31, 2020 were accrued over-funded benefit plan assets related to the Company’s qualified domestic pension plan and other intangible assets