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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Company's revenues and income by segment [Table Text Block]
(for the year ended December 31, in millions)Business
Insurance		Bond &
Specialty
Insurance		Personal
Insurance		Total
Reportable
Segments
2022
Premiums$17,095 $3,418 $13,250 $33,763 
Net investment income1,864 258 440 2,562 
Fee income382 — 30 412 
Other revenues248 20 83 351 
Total segment revenues (1)
$19,589 $3,696 $13,803 $37,088 
Amortization and depreciation$3,344 $697 $2,293 $6,334 
Income tax expense (benefit)536 195 (90)641 
Segment income (loss) (1)
2,531 908 (140)3,299 
2021
Premiums$15,734 $3,138 $11,983 $30,855 
Net investment income2,265 247 521 3,033 
Fee income375 — 27 402 
Other revenues235 23 97 355 
Total segment revenues (1)
$18,609 $3,408 $12,628 $34,645 
Amortization and depreciation$3,180 $643 $2,084 $5,907 
Income tax expense499 165 179 843 
Segment income (1)
2,385 668 760 3,813 
2020
Premiums$15,294 $2,823 $10,927 $29,044 
Net investment income1,633 213 381 2,227 
Fee income405 — 24 429 
Other revenues176 27 76 279 
Total segment revenues (1)
$17,508 $3,063 $11,408 $31,979 
Amortization and depreciation$3,069 $579 $1,908 $5,556 
Income tax expense 213 107 308 628 
Segment income (1)
1,309 473 1,195 2,977 
_________________________________________
(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 excludes the after-tax impact of net realized investment gains (losses) and income (loss) from "interest expense and other."
Net written premiums by market [Table Text Block] Net written premiums by market were as follows:
(for the year ended December 31, in millions)202220212020
Business Insurance:
Domestic:
Select Accounts$3,099 $2,833 $2,821 
Middle Market9,923 8,933 8,511 
National Accounts1,085 987 996 
National Property and Other2,467 2,265 2,086 
Total Domestic16,574 15,018 14,414 
International1,061 1,074 1,017 
Total Business Insurance17,635 16,092 15,431 
Bond & Specialty Insurance:
Domestic:
Management Liability2,112 1,983 1,769 
Surety1,081 888 845 
Total Domestic3,193 2,871 2,614 
International539 505 337 
Total Bond & Specialty Insurance3,732 3,376 2,951 
Personal Insurance:
Domestic:
Automobile6,482 5,827 5,369 
Homeowners and Other6,916 5,980 5,329 
Total Domestic13,398 11,807 10,698 
International649 684 652 
Total Personal Insurance14,047 12,491 11,350 
Total consolidated net written premiums$35,414 $31,959 $29,732 
Business segment reconciliations of revenue and income, net of tax [Table Text Block]
(for the year ended December 31, in millions)202220212020
Revenue reconciliation
Earned premiums
Business Insurance:
Domestic:
Workers’ compensation$3,425 $3,227 $3,378 
Commercial automobile2,976 2,855 2,761 
Commercial property2,611 2,275 2,087 
General liability2,875 2,576 2,401 
Commercial multi-peril4,109 3,667 3,552 
Other76 65 54 
Total Domestic16,072 14,665 14,233 
International1,023 1,069 1,061 
Total Business Insurance17,095 15,734 15,294 
Bond & Specialty Insurance:
Domestic:
Fidelity and surety1,173 1,091 1,075 
General liability1,556 1,415 1,219 
Other222 220 237 
Total Domestic2,951 2,726 2,531 
International467 412 292 
Total Bond & Specialty Insurance3,418 3,138 2,823 
Personal Insurance:
Domestic
Automobile6,170 5,687 5,280 
Homeowners and Other6,426 5,608 4,988 
Total Domestic12,596 11,295 10,268 
International654 688 659 
Total Personal Insurance13,250 11,983 10,927 
Total earned premiums33,763 30,855 29,044 
Net investment income2,562 3,033 2,227 
Fee income412 402 429 
Other revenues351 355 279 
Total segment revenues37,088 34,645 31,979 
Net realized investment gains (losses)(204)171 2 
Total revenues$36,884 $34,816 $31,981 
Income reconciliation, net of tax
Total segment income$3,299 $3,813 $2,977 
Interest Expense and Other (1)
(301)(291)(291)
Core income2,998 3,522 2,686 
Net realized investment gains (losses)(156)132 11 
Impact of changes in tax laws and/or tax rates (2)
— 8 — 
Net income$2,842 $3,662 $2,697 
______________________________________
(1)    The primary component of Interest Expense and Other was after-tax interest expense of $277 million, $269 million and $268 million in 2022, 2021 and 2020, respectively.
(2)    Impact is recognized in the accounting period in which the change is enacted.
Asset reconciliation [Table Text Block]
(at December 31, in millions)20222021
Asset reconciliation:
Business Insurance$86,522 $90,353 
Bond & Specialty Insurance10,119 10,146 
Personal Insurance18,275 18,983 
Total assets for reportable segments114,916 119,482 
Other assets (1)
801 984 
Total consolidated assets$115,717 $120,466 
___________________________________________
(1)    The primary components of other assets at both December 31, 2022 and 2021, were the over-funded benefit plan assets related to the Company's qualified domestic pension plan and other intangible assets.
Revenues of the Company's operations based on location [Table Text Block]
The following table presents revenues of the Company’s operations based on location:
(for the year ended December 31, in millions)202220212020
U.S.$34,822 $32,596 $30,123 
Non-U.S.:
Canada1,300 1,351 1,278 
Other Non-U.S.762 869 580 
Total Non-U.S.2,062 2,220 1,858 
Total revenues$36,884 $34,816 $31,981