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Segment Information
 9 Months Ended
Sep. 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 and total assets by reportable business segments:
(For the three months ended September 30, in millions) Business
Insurance		Bond & Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2021    
Premiums$3,970 $806 $3,053 $7,829 
Net investment income575 63 133 771 
Fee income90 — 7 97 
Other revenues69 5 26 100 
Total segment revenues (1)
$4,704 $874 $3,219 $8,797 
Segment income (loss) (1)
$558 $174 $(2)$730 
2020    
Premiums$3,841 $723 $2,816 $7,380 
Net investment income498 58 115 671 
Fee income95 — 6 101 
Other revenues58 7 21 86 
Total segment revenues (1)
$4,492 $788 $2,958 $8,238 
Segment income (1)
$365 $115 $392 $872 
_________________________________________________________
(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 excluding the after-tax impact of net realized investment gains (losses) and income (loss) from "interest expense and other."

(For the nine months ended September 30, in millions) Business
Insurance		Bond & Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2021    
Premiums$11,649 $2,325 $8,857 $22,831 
Net investment income1,713 186 391 2,290 
Fee income282 — 20 302 
Other revenues179 17 73 269 
Total segment revenues (1)
$13,823 $2,528 $9,341 $25,692 
Segment income (1)
$1,518 $498 $433 $2,449 
2020    
Premiums$11,440 $2,083 $8,041 $21,564 
Net investment income1,131 155 264 1,550 
Fee income305 — 18 323 
Other revenues125 17 53 195 
Total segment revenues (1)
$13,001 $2,255 $8,376 $23,632 
Segment income (1)
$596 $309 $738 $1,643 
_________________________________________________________
(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
September 30,		Nine Months Ended
September 30,
(in millions)2021202020212020
Revenue reconciliation    
Earned premiums    
Business Insurance:    
Domestic:    
Workers’ compensation$789 $851 $2,410 $2,568 
Commercial automobile718 698 2,122 2,058 
Commercial property582 522 1,669 1,544 
General liability662 605 1,887 1,786 
Commercial multi-peril939 891 2,708 2,660 
Other17 15 45 38 
Total Domestic3,707 3,582 10,841 10,654 
International263 259 808 786 
Total Business Insurance3,970 3,841 11,649 11,440 
Bond & Specialty Insurance:    
Domestic:    
Fidelity and surety277 277 819 805 
General liability365 310 1,043 893 
Other54 60 165 178 
Total Domestic696 647 2,027 1,876 
International110 76 298 207 
Total Bond & Specialty Insurance806 723 2,325 2,083 
Personal Insurance:    
Domestic:    
Automobile1,445 1,391 4,220 3,896 
Homeowners and Other1,437 1,262 4,122 3,659 
Total Domestic2,882 2,653 8,342 7,555 
International171 163 515 486 
Total Personal Insurance3,053 2,816 8,857 8,041 
Total earned premiums7,829 7,380 22,831 21,564 
Net investment income771 671 2,290 1,550 
Fee income97 101 302 323 
Other revenues100 86 269 195 
Total segment revenues8,797 8,238 25,692 23,632 
Net realized investment gains (losses)8 37 113 (48)
Total revenues$8,805 $8,275 $25,805 $23,584 
Income reconciliation, net of tax    
Total segment income$730 $872 $2,449 $1,643 
Interest Expense and Other (1)
(75)(74)(216)(219)
Core income655 798 2,233 1,424 
Net realized investment gains (losses)7 29 88 (37)
Impact of changes in tax laws and/or tax rates (2)
— — 8 — 
Net income$662 $827 $2,329 $1,387 
_________________________________________________________
(1) The primary component of Interest Expense and Other was after-tax interest expense of $69 million for both the three months ended September 30, 2021 and 2020 and $199 million and $202 million for the nine months ended September 30, 2021 and 2020, respectively.
(2) Impact is recognized in the accounting period in which the change is enacted.
(in millions)September 30,
2021		December 31,
2020
Asset reconciliation  
Business Insurance$90,661 $88,422 
Bond & Specialty Insurance10,313 9,420 
Personal Insurance19,028 18,328 
Total assets by reportable segment120,002 116,170 
Other assets (1)
704 594 
Total consolidated assets$120,706 $116,764 
 _________________________________________________________
(1)The primary components of other assets at both September 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.