Consolidated Investment Entities (Details 5) (Consolidated Investment Entities:, USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt and stated interest rates
Carrying value of debt	$ 5,221	$ 5,178
Debt of consolidated CDOs due 2012-2021
Debt and stated interest rates
Carrying value of debt	4,691	4,712
Weighted Average Interest Rate (as a percent)	1.00%	0.90%
Floating rate revolving credit borrowings due 2014
Debt and stated interest rates
Carrying value of debt	308	378
Weighted Average Interest Rate (as a percent)	2.90%	3.20%
Floating rate revolving credit borrowings due 2015
Debt and stated interest rates
Carrying value of debt	104	88
Weighted Average Interest Rate (as a percent)	2.50%	3.00%
Floating rate revolving credit borrowings due 2017
Debt and stated interest rates
Carrying value of debt	$ 118
Weighted Average Interest Rate (as a percent)	4.70%