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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Total premiums earned $ 1,065 $ 1,027 $ 2,087 $ 2,025
Net investment income 460 423 895 834
Other income 47 80 106 126
Revenues before realized gains (losses) 1,638 1,595 3,211 3,088
Realized gains (losses) on securities 8 (16) 11 (34)
Realized gains on subsidiaries 0 2 0 2
Total revenues 1,646 1,581 3,222 3,056
Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 1,065 1,027 2,087 2,025
Net investment income 96 89 182 172
Other income [1] 4 40 20 43
Revenues before realized gains (losses) 1,165 1,156 2,289 2,240
Annuity        
Segment Reporting Information [Line Items]        
Net investment income 360 344 707 659
Other income 26 24 53 50
Revenues before realized gains (losses) 386 368 760 709
Run-off Long-term Care and Life        
Segment Reporting Information [Line Items]        
Revenues before realized gains (losses) 11 12 23 24
Other        
Segment Reporting Information [Line Items]        
Revenues before realized gains (losses) 76 59 139 115
Specialty Property and transportation | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 357 365 699 704
Specialty casualty | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 537 497 1,045 999
Specialty financial | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 146 139 293 271
Other specialty | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned $ 25 $ 26 $ 50 $ 51
[1] Includes pretax income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017 and pretax income of $32 million (before noncontrolling interest) from the sale of an apartment property in the second quarter of 2016.