Segment Information (Details)
$ in Millions |
3 Months Ended |
|
Mar. 31, 2020
USD ($)
segment
|
Mar. 31, 2019
USD ($)
|
| Segment reporting information |
|
|
| Number of reportable business segments | segment |
3
|
|
| Premiums |
$ 7,229
|
$ 6,855
|
| Net investment income |
611
|
582
|
| Fee income |
108
|
109
|
| Other revenues |
58
|
72
|
| Net realized investment gains (losses) |
(98)
|
53
|
| Total revenues |
7,908
|
7,671
|
| Core income (loss) |
676
|
755
|
| Net realized investment gains (losses), net of tax |
(76)
|
41
|
| Net income |
600
|
796
|
| Reportable Segments [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
7,229
|
6,855
|
| Net investment income |
611
|
582
|
| Fee income |
108
|
109
|
| Other revenues |
58
|
71
|
| Total segment revenues |
8,006
|
7,617
|
| Core income (loss) |
747
|
830
|
| Reportable Segments [Member] | Business Insurance [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
3,864
|
3,742
|
| Net investment income |
453
|
427
|
| Fee income |
102
|
104
|
| Other revenues |
31
|
43
|
| Total segment revenues |
4,450
|
4,316
|
| Core income (loss) |
289
|
414
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
3,590
|
3,475
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Workers' compensation [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
899
|
972
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Automobile [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
684
|
628
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial property [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
508
|
460
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | General liability [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
601
|
567
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial multi-peril [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
886
|
840
|
| Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Other [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
12
|
8
|
| Reportable Segments [Member] | Business Insurance [Member] | International [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
274
|
267
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
667
|
606
|
| Net investment income |
55
|
56
|
| Fee income |
0
|
0
|
| Other revenues |
5
|
6
|
| Total segment revenues |
727
|
668
|
| Core income (loss) |
122
|
138
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
602
|
555
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | General liability [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
287
|
257
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Fidelity and surety [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
257
|
246
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Other [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
58
|
52
|
| Reportable Segments [Member] | Bond & Specialty Insurance [Member] | International [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
65
|
51
|
| Reportable Segments [Member] | Personal Insurance [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
2,698
|
2,507
|
| Net investment income |
103
|
99
|
| Fee income |
6
|
5
|
| Other revenues |
22
|
22
|
| Total segment revenues |
2,829
|
2,633
|
| Core income (loss) |
336
|
278
|
| Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
2,527
|
2,336
|
| Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Automobile [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
1,351
|
1,297
|
| Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Homeowners and Other [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
1,176
|
1,039
|
| Reportable Segments [Member] | Personal Insurance [Member] | International [Member] |
|
|
| Segment reporting information |
|
|
| Premiums |
171
|
171
|
| Other [Member] |
|
|
| Segment reporting information |
|
|
| Other revenues |
0
|
1
|
| Core income (loss) |
(71)
|
(75)
|
| After-tax interest expense |
$ 66
|
$ 70
|