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Segment and Geographic Information (Net Revenues and Assets by Geographic Area) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Net Revenues $ 6,953 [1] $ 9,207 [1] $ 13,888 [1] $ 16,781 [1]  
Total assets 748,517 [2]   748,517 [2]   749,898 [2]
Americas
          
Net Revenues 5,114 6,599 9,904 12,065  
Europe, Middle East and Africa
          
Net Revenues 978 1,527 2,132 3,194  
Asia
          
Net Revenues $ 861 $ 1,081 $ 1,852 $ 1,522  
[1] In certain management fee arrangements, the Company is entitled to receive performance-based fees (also referred to as incentive fees) when the return on assets under management exceeds certain benchmark returns or other performance targets. In such arrangements, performance fee revenue is accrued (or reversed) quarterly based on measuring account fund performance to date versus the performance benchmark stated in the investment management agreement. The amount of performance-based fee revenue at risk of reversing if fund performance falls below stated investment management agreement benchmarks was approximately $188 million at June 30, 2012 and approximately $179 million at December 31, 2011 (see Note 2 to the consolidated financial statements for the year ended December 31, 2011 included in the Form 10-K).
[2] Corporate assets have been fully allocated to the Company’s business segments.