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Acquisitions and Sale of Businesses - Impact of the sale of subsidiaries sold (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 24, 2015
Jun. 30, 2016
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liabilities of businesses sold:            
Realized gains (losses) on subsidiaries       $ 0 $ 2 $ (161)
Run-off long-term care insurance business            
Sale of Businesses            
Net sale proceeds [1] $ 13          
Assets of businesses sold:            
Cash and investments 1,334          
Recoverables from reinsurers 630          
Deferred policy acquisition costs 16          
Other receivables 16          
Other assets (4)          
Goodwill 2          
Total assets 1,994          
Liabilities of businesses sold:            
Annuity benefits accumulated 261          
Life, accident and health reserves 1,525          
Other liabilities 7          
Total liabilities 1,793          
Reclassify net unrealized gain on marketable securities 22          
Net assets of businesses sold 179          
Realized gains (losses) on subsidiaries (166) $ 2 $ (162)      
Tax benefit 58          
Loss on subsidiaries, net of tax $ (108)   $ (105)      
[1] Includes the fair value of the potential additional consideration and capital maintenance agreement and is shown net of estimated expenses.