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Segment information Segment Information (narrative Detail (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Gain (Loss) on Derivative $ 29 $ 63 $ 108 $ 90
Net investment income 828 770 1,634 1,515
North America Agricultural Insurance [Member]        
Segment Reporting Information [Line Items]        
Segment Income Loss Including Gains Losses On Crop Derivatives 43      
Gain (Loss) on Derivative 8      
Net investment income 6 6 13 12
Segment Life [Member]        
Segment Reporting Information [Line Items]        
Net investment income 85 $ 77 $ 168 $ 152
Management Underwriting Income (Loss) 75      
Gains(Losses) On Fair Value Changes In Separate Account Assets $ (10)