Closed Block (Details 3) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Change in the maximum future earnings of the closed block
Balance, end of period	$ 4,323	$ 4,519	$ 4,323	$ 4,519
Balance, beginning of period	4,361	4,513	4,441	4,587
Change during period	$ (38)	$ 6	$ (118)	$ (68)

The carrying amount of closed block liabilities in excess of the carrying amount of closed block assets at the date of demutualization (adjusted to eliminate the impact of related amounts in accumulated other comprehensive income).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 805

-Section 50

-Paragraph 3

-Subparagraph (b)(9)

-URI http://asc.fasb.org/extlink&oid=6487222&loc=d3e30806-158569

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 00-3

-Paragraph 25

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 AICPA

-Name Statement of Position (SOP)

-Number 00-3

-Section Appendix A

-Paragraph 78

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 805

-Section 55

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6588659&loc=d3e31071-158570

Name:	us-gaap_ClosedBlockAssetsAndLiabilitiesMaximumFutureEarningsToBeRecognized
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant