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Acquisitions (Detail) (USD $)
1 Months Ended 1 Months Ended
Jun. 17, 2014
Apr. 30, 2013
Fianzas Monterrey [Member]
Apr. 02, 2013
Fianzas Monterrey [Member]
May 31, 2013
ABA Seguros [Member]
May 02, 2013
ABA Seguros [Member]
Jun. 17, 2014
The Siam Commercial Samaggi Insurance PCL [Member]
Apr. 28, 2014
The Siam Commercial Samaggi Insurance PCL [Member]
Jul. 04, 2014
Large Corporate P&C Business Of Itau Seguros [Member]
Subsequent Event [Member]
Business Acquisition [Line Items]                
Acquisition purchase price   $ 293,000,000   $ 690,000,000        
Business Acquisition, Percentage of Voting Interests Acquired             60.86%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage           32.17%    
Business Acquisition, Purchase Price Allocation, Goodwill Amount     137,000,000   285,000,000   46  
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill     73,000,000   140,000,000   80  
Business Acquisition, Cost of Acquired Entity, Expected Cash Consideration             $ 176,000,000 $ 685,000,000
Business Combination Total Ownership Percentage 93.03%