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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment reporting information        
Premiums $ 7,179 $ 6,882 $ 21,022 $ 20,114
Net investment income 622 646 1,852 1,844
Fee income 121 109 346 324
Other revenues 68 57 197 150
Net realized investment gains [1] 23 29 101 54
Total revenues 8,013 7,723 23,518 22,486
Core income (loss) 378 687 1,670 1,859
Net realized investment gains, net of tax 18 22 79 43
Net income 396 709 1,749 1,902
Reportable Segments [Member]        
Segment reporting information        
Premiums 7,179 6,882 21,022 20,114
Net investment income 622 646 1,852 1,844
Fee income 121 109 346 324
Other revenues 68 55 196 148
Total segment revenues 7,990 7,692 23,416 22,430
Core income (loss) 449 759 1,892 2,085
Reportable Segments [Member] | Business Insurance [Member]        
Segment reporting information        
Premiums 3,882 3,743 11,407 10,952
Net investment income 457 482 1,365 1,368
Fee income 114 103 329 309
Other revenues 39 33 112 84
Total segment revenues 4,492 4,361 13,213 12,713
Core income (loss) 179 410 944 1,247
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member]        
Segment reporting information        
Premiums 3,615 3,480 10,610 10,160
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Workers' compensation [Member]        
Segment reporting information        
Premiums 969 988 2,891 2,932
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Automobile [Member]        
Segment reporting information        
Premiums 672 611 1,947 1,760
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial property [Member]        
Segment reporting information        
Premiums 496 466 1,429 1,357
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | General liability [Member]        
Segment reporting information        
Premiums 594 558 1,746 1,614
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial multi-peril [Member]        
Segment reporting information        
Premiums 872 850 2,568 2,477
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Other [Member]        
Segment reporting information        
Premiums 12 7 29 20
Reportable Segments [Member] | Business Insurance [Member] | International [Member]        
Segment reporting information        
Premiums 267 263 797 792
Reportable Segments [Member] | Bond & Specialty Insurance [Member]        
Segment reporting information        
Premiums 653 617 1,891 1,800
Net investment income 59 57 173 172
Fee income 0 0 0 0
Other revenues 7 5 19 16
Total segment revenues 719 679 2,083 1,988
Core income (loss) 139 196 451 573
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member]        
Segment reporting information        
Premiums 595 566 1,727 1,651
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | General liability [Member]        
Segment reporting information        
Premiums 276 255 799 745
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Fidelity and surety [Member]        
Segment reporting information        
Premiums 265 261 769 760
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Other [Member]        
Segment reporting information        
Premiums 54 50 159 146
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | International [Member]        
Segment reporting information        
Premiums 58 51 164 149
Reportable Segments [Member] | Personal Insurance [Member]        
Segment reporting information        
Premiums 2,644 2,522 7,724 7,362
Net investment income 106 107 314 304
Fee income 7 6 17 15
Other revenues 22 17 65 48
Total segment revenues 2,779 2,652 8,120 7,729
Core income (loss) 131 153 497 265
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member]        
Segment reporting information        
Premiums 2,463 2,348 7,198 6,851
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Automobile [Member]        
Segment reporting information        
Premiums 1,344 1,297 3,962 3,783
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Homeowners and Other [Member]        
Segment reporting information        
Premiums 1,119 1,051 3,236 3,068
Reportable Segments [Member] | Personal Insurance [Member] | International [Member]        
Segment reporting information        
Premiums 181 174 526 511
Other [Member]        
Segment reporting information        
Other revenues 0 2 1 2
Core income (loss) (71) (72) (222) (226)
After-tax interest expense $ 66 $ 68 $ 206 $ 209
[1]
Total other-than-temporary impairment (OTTI) losses were $0 million for each of the three months ended September 30, 2019 and 2018, and $(2) million and $(1) million for the nine months ended September 30, 2019 and September 30, 2018, respectively.  Of total OTTI, credit losses of $0 million for each of the three months ended September 30, 2019 and 2018, and $(2) million and $(1) million for the nine months ended September 30, 2019 and September 30, 2018, respectively, were recognized in net realized investment gains.  In addition, unrealized gains (losses) from other changes in total OTTI of $0 million for each of the three months and nine months ended September 30, 2019 and 2018 were recognized in other comprehensive income (loss) as part of changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income.