Consolidated Investment Entities (Details 5) (Consolidated Investment Entities, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt and stated interest rates
Carrying value of debt	$ 4,981	$ 5,178
Debt of consolidated CDOs due 2013-2021
Debt and stated interest rates
Carrying value of debt	4,450	4,712
Weighted Average Interest Rate (as a percent)	0.90%	0.90%
Floating rate revolving credit borrowings due 2014
Debt and stated interest rates
Carrying value of debt	309	378
Weighted Average Interest Rate (as a percent)	2.60%	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)	2.40%	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)	4.50%