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Segment Information (details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment reporting information    
Premiums $ 6,183 $ 5,981
Net investment income 610 544
Fee income 113 117
Other revenues 31 53
Core income (loss) 614 698
Net realized investment gains (losses) [1] 5 (9)
Total revenues 6,942 6,686
Net realized investment gains (losses), net of tax 3 (7)
Net income 617 691
Reportable Segments [Member]    
Segment reporting information    
Premiums 6,183 5,981
Net investment income 610 544
Fee income 113 117
Other revenues 30 50
Total segment revenues 6,936 6,692
Core income (loss) 676 759
Reportable Segments [Member] | Business Insurance [Member]    
Segment reporting information    
Premiums 3,429 3,414
Net investment income 453 399
Fee income 109 114
Other revenues 9 30
Total segment revenues 4,000 3,957
Core income (loss) 442 447
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 3,189 3,178
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Workers' compensation [Member]    
Segment reporting information    
Premiums 976 981
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Automobile [Member]    
Segment reporting information    
Premiums 506 491
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial property [Member]    
Segment reporting information    
Premiums 435 437
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | General liability [Member]    
Segment reporting information    
Premiums 491 482
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial multi-peril [Member]    
Segment reporting information    
Premiums 774 782
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Other [Member]    
Segment reporting information    
Premiums 7 5
Reportable Segments [Member] | Business Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 240 236
Reportable Segments [Member] | Bond & Specialty Insurance [Member]    
Segment reporting information    
Premiums 555 552
Net investment income 61 60
Other revenues 5 4
Total segment revenues 621 616
Core income (loss) 145 160
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 514 508
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | General liability [Member]    
Segment reporting information    
Premiums 235 234
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Fidelity and surety [Member]    
Segment reporting information    
Premiums 234 230
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Other [Member]    
Segment reporting information    
Premiums 45 44
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 41 44
Reportable Segments [Member] | Personal Insurance [Member]    
Segment reporting information    
Premiums 2,199 2,015
Net investment income 96 85
Fee income 4 3
Other revenues 16 16
Total segment revenues 2,315 2,119
Core income (loss) 89 152
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member]    
Segment reporting information    
Premiums 2,049 1,874
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Automobile [Member]    
Segment reporting information    
Premiums 1,094 936
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Homeowners and Other [Member]    
Segment reporting information    
Premiums 955 938
Reportable Segments [Member] | Personal Insurance [Member] | International [Member]    
Segment reporting information    
Premiums 150 141
Other [Member]    
Segment reporting information    
Other revenues 1 3
Core income (loss) (62) (61)
After-tax interest expense $ 58 $ 59
[1] Total other-than-temporary impairment (OTTI) losses were $(1) million and $(28) million for the three months ended March 31, 2017 and 2016, respectively. Of total OTTI, credit losses of $(2) million and $(18) million for the three months ended March 31, 2017 and 2016, respectively, were recognized in net realized investment gains (losses). In addition, unrealized gains (losses) from other changes in total OTTI of $1 million and $(10) million for the three months ended March 31, 2017 and 2016, respectively, were recognized in other comprehensive income as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.