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Acquisitions (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 1 Months Ended
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]
Oct. 31, 2014
Large Corporate P&C Business Of Itau Seguros [Member]
Subsequent Event [Member]
Business Acquisition [Line Items]              
Acquisition purchase price $ 293   $ 690        
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   285   46  
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill   73   140   80  
Business Acquisition, Cost of Acquired Entity, Expected Cash Consideration           $ 176 $ 630
Business Combination Total Ownership Percentage         93.03%