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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Total premiums earned $ 1,022 $ 998
Net investment income 435 411
Other income 59 46
Revenues before realized gains (losses) 1,573 1,493
Realized gains (losses) on securities 3 (18)
Total revenues 1,576 1,475
Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 1,022 998
Net investment income 86 83
Other income [1] 16 3
Revenues before realized gains (losses) 1,124 1,084
Annuity    
Segment Reporting Information [Line Items]    
Net investment income 347 315
Other income 27 26
Revenues before realized gains (losses) 374 341
Run-off Long-term Care and Life    
Segment Reporting Information [Line Items]    
Revenues before realized gains (losses) 12 12
Other    
Segment Reporting Information [Line Items]    
Revenues before realized gains (losses) 63 56
Specialty Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 342 339
Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 508 502
Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 147 132
Other specialty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned $ 25 $ 25
[1] Includes pretax income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.