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Segment Information
 3 Months Ended
Mar. 31, 2023
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 the notes to the consolidated financial statements in the Company’s 2022 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
2023    
Premiums$4,477 $875 $3,502 $8,854 
Net investment income473 73 117 663 
Fee income99 — 7 106 
Other revenues47 5 23 75 
Total segment revenues (1)
$5,096 $953 $3,649 $9,698 
Segment income (1)
$756 $207 $83 $1,046 
2022    
Premiums$4,071 $820 $3,123 $8,014 
Net investment income468 59 110 637 
Fee income96 — 7 103 
Other revenues53 4 21 78 
Total segment revenues (1)
$4,688 $883 $3,261 $8,832 
Segment income (1)
$669 $217 $225 $1,111 
________________________________________________________
(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 excludes 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)20232022
Revenue reconciliation  
Earned premiums  
Business Insurance:  
Domestic:  
Workers’ compensation$850 $830 
Commercial automobile761 713 
Commercial property709 608 
General liability760 688 
Commercial multi-peril1,100 967 
Other18 17 
Total Domestic4,198 3,823 
International279 248 
Total Business Insurance4,477 4,071 
Bond & Specialty Insurance:  
Domestic:  
Fidelity and surety306 274 
General liability398 373 
Other54 55 
Total Domestic758 702 
International117 118 
Total Bond & Specialty Insurance875 820 
Personal Insurance:  
Domestic:  
Automobile1,624 1,458 
Homeowners and Other1,724 1,496 
Total Domestic3,348 2,954 
International154 169 
Total Personal Insurance3,502 3,123 
Total earned premiums8,854 8,014 
Net investment income663 637 
Fee income106 103 
Other revenues75 78 
Total segment revenues9,698 8,832 
Net realized investment gains (losses)6 (23)
Total revenues$9,704 $8,809 
Income reconciliation, net of tax  
Total segment income$1,046 $1,111 
Interest Expense and Other (1)
(76)(74)
Core income970 1,037 
Net realized investment gains (losses)5 (19)
Net income$975 $1,018 
_________________________________________________________
(1)The primary component of Interest Expense and Other was after-tax interest expense of $70 million and $69 million for the three months ended March 31, 2023 and 2022, respectively.
(in millions)March 31,
2023		December 31,
2022
Asset reconciliation  
Business Insurance$88,468 $86,522 
Bond & Specialty Insurance10,539 10,119 
Personal Insurance18,514 18,275 
Total assets by reportable segment117,521 114,916 
Other assets (1)
831 801 
Total consolidated assets$118,352 $115,717 
 _________________________________________________________
(1)The primary components of other assets at both March 31, 2023 and December 31, 2022 were the over-funded benefit plan assets related to the Company’s qualified domestic pension plan and other intangible assets.