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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment reporting information    
Premiums $ 6,537 $ 6,183
Net investment income 603 610
Fee income 103 113
Other revenues 54 31
Net realized investment gains (losses) [1] (11) 5
Total revenues 7,286 6,942
Core income 678 614
Net realized investment gains (losses), net of tax (9) 3
Net income 669 617
Reportable Segments [Member]    
Segment reporting information    
Premiums 6,537 6,183
Net investment income 603 610
Fee income 103 113
Other revenues 54 30
Total segment revenues 7,297 6,936
Core income 754 676
Reportable Segments [Member] | Business Insurance [Member]    
Segment reporting information    
Premiums 3,568 3,429
Net investment income 446 453
Fee income 99 109
Other revenues 31 9
Total segment revenues 4,144 4,000
Core income 452 442
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 3,304 3,189
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Workers' compensation [Member]    
Segment reporting information    
Premiums 971 976
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Automobile [Member]    
Segment reporting information    
Premiums 562 506
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial property [Member]    
Segment reporting information    
Premiums 438 435
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | General liability [Member]    
Segment reporting information    
Premiums 521 491
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial multi-peril [Member]    
Segment reporting information    
Premiums 805 774
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Other [Member]    
Segment reporting information    
Premiums 7 7
Reportable Segments [Member] | Business Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 264 240
Reportable Segments [Member] | Bond & Specialty Insurance [Member]    
Segment reporting information    
Premiums 582 555
Net investment income 58 61
Other revenues 6 5
Total segment revenues 646 621
Core income 173 145
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 535 514
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | General liability [Member]    
Segment reporting information    
Premiums 242 235
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Fidelity and surety [Member]    
Segment reporting information    
Premiums 246 234
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Other [Member]    
Segment reporting information    
Premiums 47 45
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 47 41
Reportable Segments [Member] | Personal Insurance [Member]    
Segment reporting information    
Premiums 2,387 2,199
Net investment income 99 96
Fee income 4 4
Other revenues 17 16
Total segment revenues 2,507 2,315
Core income 129 89
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 2,220 2,049
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Automobile [Member]    
Segment reporting information    
Premiums 1,225 1,094
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Homeowners and Other [Member]    
Segment reporting information    
Premiums 995 955
Reportable Segments [Member] | Personal Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 167 150
Other [Member]    
Segment reporting information    
Other revenues   1
Core income (76) (62)
After-tax interest expense $ 70 $ 58
[1] Total other-than-temporary impairment (OTTI) gains (losses) were $0 and $(1) million for the three months ended March 31, 2018 and 2017, respectively. Of total OTTI, credit losses of $0 and $(2) million for the three months ended March 31, 2018 and 2017, respectively, were recognized in net realized investment gains (losses). In addition, unrealized gains from other changes in total OTTI of $0 and $1 million for the three months ended March 31, 2018 and 2017, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.