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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Total premiums earned $ 1,173 $ 1,107
Net investment income 542 495
Other income 50 49
Revenues before realized gains (losses) 1,840 1,712
Realized gains (losses) on securities 184 (93)
Total revenues 2,024 1,619
Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 1,173 1,107
Net investment income 104 100
Other income 3 2
Revenues before realized gains (losses) 1,280 1,209
Annuity    
Segment Reporting Information [Line Items]    
Net investment income 435 394
Other income 27 26
Revenues before realized gains (losses) 462 420
Other    
Segment Reporting Information [Line Items]    
Revenues before realized gains (losses) 98 83
Specialty Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 361 350
Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 629 579
Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned 146 149
Other specialty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Total premiums earned $ 37 $ 29