Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Oct. 18, 2012 ABA Seguros [Member]	Jan. 03, 2013 PT Asuransi Jaya Proteksi (JaPro) [Member]	Sep. 18, 2012 PT Asuransi Jaya Proteksi (JaPro) [Member]	Apr. 01, 2013 Subsequent Event [Member] Fianzas Monterrey [Member]
Business Acquisition [Line Items]
Acquisition purchase price	$ 865	$ 107		$ 293
Business Acquisition, Percentage of Voting Interests Acquired		20.00%	80.00%

Amount of cash paid to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant