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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total premiums earned $ 1,107 $ 1,022
Net investment income 495 435
Other income 49 59
Revenues before realized gains (losses) 1,712 1,573
Realized gains (losses) on securities (93) 3
Total revenues 1,619 1,576
Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 1,107 1,022
Net investment income 100 86
Other income [1] 2 16
Revenues before realized gains (losses) 1,209 1,124
Annuity    
Segment Reporting Information [Line Items]    
Net investment income 394 347
Other income 26 27
Revenues before realized gains (losses) 420 374
Other    
Segment Reporting Information [Line Items]    
Revenues before realized gains (losses) 83 75
Specialty Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 350 342
Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 579 508
Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 149 147
Other specialty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned $ 29 $ 25
[1] Includes income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.