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Summary of Significant Accounting Policies (details) - Acquisition - USD ($)
$ in Millions
Nov. 01, 2013
Dec. 31, 2015
Oct. 01, 2015
Dec. 31, 2014
Business Acquisition        
Goodwill acquired   $ 3,573   $ 3,611
Dominion [Member]        
Business Acquisition        
Purchase price $ 1,035      
Assets acquired 3,910      
Liabilities assumed 2,880      
Intangible assets acquired 16      
Goodwill acquired 273      
Value of business acquired (VOBA) $ 76      
Travelers Participacoes em Seguros Brasil S.A. [Member]        
Business Acquisition        
Percentage of common stock acquired     100.00%