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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Total premiums earned $ 1,267 $ 1,159 $ 3,354 $ 3,184
Net investment income 471 433 1,366 1,267
Other income 48 46 154 172
Revenues before realized gains (losses) 1,847 1,703 5,058 4,791
Realized gains (losses) on securities (12) 2 (1) (32)
Realized gains on subsidiaries 0 0 0 2
Total revenues 1,835 1,705 5,057 4,761
Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 1,267 1,159 3,354 3,184
Net investment income 94 93 276 265
Other income [1] 1 3 21 46
Revenues before realized gains (losses) 1,362 1,255 3,651 3,495
Annuity        
Segment Reporting Information [Line Items]        
Net investment income 375 351 1,082 1,010
Other income 26 26 79 76
Revenues before realized gains (losses) 401 377 1,161 1,086
Run-off Long-term Care and Life        
Segment Reporting Information [Line Items]        
Revenues before realized gains (losses) 12 13 35 37
Other        
Segment Reporting Information [Line Items]        
Revenues before realized gains (losses) 72 58 211 173
Specialty Property and transportation | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 527 493 1,226 1,197
Specialty casualty | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 568 497 1,613 1,496
Specialty financial | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned 142 145 435 416
Other specialty | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Total premiums earned $ 30 $ 24 $ 80 $ 75
[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.