Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended
	Mar. 31, 2011	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2012 Asset Management [Member]	Jun. 30, 2012 Asset Management [Member]	Jun. 30, 2012 Corporate and Other [Member]	Jun. 30, 2012 Corporate and Other [Member]	Jun. 30, 2012 Closed Block [Member]	Jun. 30, 2012 Closed Block [Member]	Jun. 30, 2012 Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures [Member]	Jun. 30, 2012 Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures [Member]	Jun. 30, 2012 Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures [Member] Closed Block [Member]	Jun. 30, 2012 Included in Adjusted Operating Income [Member]	Jun. 30, 2012 Included in Adjusted Operating Income [Member]	Jun. 30, 2012 Included in Adjusted Operating Income [Member] Asset Management [Member]	Jun. 30, 2012 Included in Adjusted Operating Income [Member] Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total deferred gain (loss)			$ 609
Out of Period Adjustment	$ 95	$ 95		$ 61	$ 61	$ 45	$ 45	$ 16	$ 16	$ 122	$ 122	$ 16	$ 106	$ 106	$ 61	$ 45