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Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Sep. 18, 2012 PT Asuransi Jaya Proteksi (JaPro) [Member]	Sep. 12, 2012 Fianzas Monterrey [Member]	Oct. 18, 2012 ABA Seguros [Member]	Sep. 30, 2012 New York Life Korea And Hong Kong [Member]	Sep. 30, 2012 Penn Millers Holding Corporation [Member]
Business Acquisition [Line Items]
Percentage of business acquired	80.00%
Remaining percentage of business expected to be acquired	20.00%
Acquisition purchase price	$ 95	$ 285	$ 865	$ 450	$ 107
Goodwill generated in acquisitions				91
Goodwill expected to be deductible for income tax				0
Other intangible assets generated in acquisition				$ 163

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

The amount of identifiable intangible assets recognized as of the acquisition date.