Consolidated Investment Entities (Debt of Consolidated Investment Entities) (Details 5) (Consolidated investment entities [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt and stated interest rates
Carrying value of debt	$ 6,394	$ 5,736
Debt of Consolidated CDOs Maturing in 2016 to 2026 [Member]
Debt and stated interest rates
Carrying value of debt	5,466	4,804
Weighted average interest rate	1.20%	1.00%
Floating rate revolving credit borrowings due 2014 [Member]
Debt and stated interest rates
Carrying value of debt	181	305
Weighted average interest rate	2.30%	2.60%
Floating rate revolving credit borrowings due 2015 [Member]
Debt and stated interest rates
Carrying value of debt	63	97
Weighted average interest rate	2.40%	2.40%
Floating rate revolving credit borrowings due 2017 [Member]
Debt and stated interest rates
Carrying value of debt	118	120
Weighted average interest rate	2.60%	4.50%
Floating rate revolving credit borrowings due 2018 [Member]
Debt and stated interest rates
Carrying value of debt	416	377
Weighted average interest rate	2.60%	3.50%
Floating rate revolving credit borrowings due 2019 [Member]
Debt and stated interest rates
Carrying value of debt	$ 150	$ 33
Weighted average interest rate	3.30%	3.00%