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Segments of Operations - Earnings before income taxes by segment and sub-segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes $ 267 $ 220
Realized gains (losses) on securities (93) 3
Earnings before income taxes 174 223
Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 91 78
Investment and other income, net [1] 93 93
Earnings before realized gains (losses) and income taxes 184 171
Annuity    
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes 125 96
Other    
Segment Reporting Information [Line Items]    
Earnings before realized gains (losses) and income taxes (42) (47)
Specialty Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 33 43
Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 41 15
Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 15 22
Other specialty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting 3 (1)
Other lines | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Property and casualty insurance underwriting [2] $ (1) $ (1)
[1] Includes income of $13 million (before noncontrolling interest) from the sale of a hotel in the first quarter of 2017.
[2] Includes holding company interest and expenses.