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Acquisitions (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 0 Months Ended 2 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 18, 2012
PT Asuransi Jaya Proteksi (JaPro)
Apr. 02, 2013
Fianzas Monterrey
May 08, 2013
ABA Seguros
May 02, 2013
ABA Seguros
Apr. 01, 2011
New York Life's Korea and Hong Kong
Feb. 02, 2011
New York Life's Korea and Hong Kong
Nov. 30, 2011
Penn Millers Holding Corporation
Dec. 28, 2011
Rio Guayas
Jan. 12, 2014
The Siam Commercial Sammagi Insurance PCL (Samaggi)
Jan. 03, 2013
Subsequent Event [Member]
PT Asuransi Jaya Proteksi (JaPro)
Jan. 12, 2014
Subsequent Event [Member]
The Siam Commercial Sammagi Insurance PCL (Samaggi)
Business Acquisition [Line Items]                            
Percentage of business acquired       80.00%               60.90% 20.00%  
Expected cash consideration for acquisition                           $ 185
Business Combination, Consideration Transferred       107   690   450   107 65      
Goodwill generated in acquisitions 4,603 4,319 4,148   135   283   91          
Other intangible assets generated in acquisition         73   140   163          
Additional investment percentage to be acquired after tender offer                           39.10%
Business Acquisition, Goodwill, Expected Tax Deductible Amount         $ 0   $ 0   $ 0