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Segment Information
 6 Months Ended
Jun. 30, 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 (loss) and total assets by reportable business segments:
(For the three months ended June 30, in millions) Business
Insurance		Bond & Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2021    
Premiums$3,880 $776 $2,960 $7,616 
Net investment income615 64 139 818 
Fee income97 — 7 104 
Other revenues57 7 24 88 
Total segment revenues (1)
$4,649 $847 $3,130 $8,626 
Segment income (1)
$643 $187 $121 $951 
2020    
Premiums$3,735 $693 $2,527 $6,955 
Net investment income180 42 46 268 
Fee income108 — 6 114 
Other revenues36 5 10 51 
Total segment revenues (1)
$4,059 $740 $2,589 $7,388 
Segment income (loss) (1)
$(58)$72 $10 $24 
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(1)Segment revenues for reportable business segments exclude net realized investment gains (losses) and revenues included in "interest expense and other." Segment income (loss) for reportable business segments equals net income (loss) excluding the after-tax impact of net realized investment gains (losses) and income (loss) from "interest expense and other."

(For the six months ended June 30, in millions) Business
Insurance		Bond & Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2021    
Premiums$7,679 $1,519 $5,804 $15,002 
Net investment income1,138 123 258 1,519 
Fee income192 — 13 205 
Other revenues110 12 47 169 
Total segment revenues (1)
$9,119 $1,654 $6,122 $16,895 
Segment income (1)
$960 $324 $435 $1,719 
2020    
Premiums$7,599 $1,360 $5,225 $14,184 
Net investment income633 97 149 879 
Fee income210 — 12 222 
Other revenues67 10 32 109 
Total segment revenues (1)
$8,509 $1,467 $5,418 $15,394 
Segment income (1)
$231 $194 $346 $771 
(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
June 30,		Six Months Ended
June 30,
(in millions)2021202020212020
Revenue reconciliation    
Earned premiums    
Business Insurance:    
Domestic:    
Workers’ compensation$810 $818 $1,621 $1,717 
Commercial automobile709 676 1,404 1,360 
Commercial property556 514 1,087 1,022 
General liability618 580 1,225 1,181 
Commercial multi-peril899 883 1,769 1,769 
Other14 11 28 23 
Total Domestic3,606 3,482 7,134 7,072 
International274 253 545 527 
Total Business Insurance3,880 3,735 7,679 7,599 
Bond & Specialty Insurance:    
Domestic:    
Fidelity and surety276 271 542 528 
General liability347 296 678 583 
Other55 60 111 118 
Total Domestic678 627 1,331 1,229 
International98 66 188 131 
Total Bond & Specialty Insurance776 693 1,519 1,360 
Personal Insurance:    
Domestic:    
Automobile1,405 1,154 2,775 2,505 
Homeowners and Other1,377 1,221 2,685 2,397 
Total Domestic2,782 2,375 5,460 4,902 
International178 152 344 323 
Total Personal Insurance2,960 2,527 5,804 5,225 
Total earned premiums7,616 6,955 15,002 14,184 
Net investment income818 268 1,519 879 
Fee income104 114 205 222 
Other revenues88 51 169 109 
Total segment revenues8,626 7,388 16,895 15,394 
Other revenues— — — — 
Net realized investment gains (losses)61 13 105 (85)
Total revenues$8,687 $7,401 $17,000 $15,309 
Income reconciliation, net of tax    
Total segment income$951 $24 $1,719 $771 
Interest Expense and Other (1)
(72)(74)(141)(145)
Core income (loss)879 (50)1,578 626 
Net realized investment gains (losses)47 10 81 (66)
Impact of changes in tax laws and/or tax rates (2)
8 — 8 — 
Net income (loss)$934 $(40)$1,667 $560 
_________________________________________________________
(1) The primary component of Interest Expense and Other was after-tax interest expense of $65 million and $67 million for the three months ended June 30, 2021 and 2020, respectively, and $130 million and $133 million for the six months ended June 30, 2021 and 2020, respectively.
(2) Impact is recognized in the accounting period in which the change is enacted.
(in millions)June 30,
2021		December 31,
2020
Asset reconciliation  
Business Insurance$90,219 $88,422 
Bond & Specialty Insurance10,073 9,420 
Personal Insurance18,846 18,328 
Total assets by reportable segment119,138 116,170 
Other assets (1)
621 594 
Total consolidated assets$119,759 $116,764 
 _________________________________________________________
(1)The primary components of other assets at both June 30, 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.