Subsequent Events (Details Textuals 1) (Subsequent Event [Member]) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
Mar. 31, 2013 USD ($)	Dec. 31, 2012 American Life [Member] Japan [Member] USD ($)	Dec. 31, 2012 American Life [Member] Japan [Member] JPY (¥)
Subsequent Event [Line Items]
American Life income tax exam refund		$ 190	¥ 16,000
Amount of American Life refund received		160
Future charge to net income related to the indemnification provisions of the Stock Purchase Agreement	$ 30

The amount of cash received during the period as refunds for the overpayment of taxes.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromIncomeTaxRefunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration