Closed Block (Details 3) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Change in the maximum future earnings of the closed block
Balance, end of period	$ 4,361	$ 4,513	$ 4,361	$ 4,513
Balance, beginning of period	4,405	4,543	4,441	4,587
Change during period	$ (44)	$ (30)	$ (80)	$ (74)

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 AICPA
-Name Statement of Position (SOP)
-Number 00-3
-Paragraph 25
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 00-3
-Section Appendix A
-Paragraph 78

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