v2.3.0.11
Regulatory Requirements (Narrative) (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Tier 1 capital, ratio 16.70% 16.10%
Total capital to RWAs 18.30% 16.50%
Tier 1 capital to RWAs, being well-capitalized for regulatory purposes 6.00%  
Total capital to RWAs, being well-capitalized for regulatory purposes 10.00%  
Tier 1 leverage ratio, being well-capitalized for regulatory purposes 5.00%  
Net capital $ 55,758,000,000 $ 54,477,000,000
Net capital, minimum amount required to hold 304,759,000,000 329,560,000,000
MS&Co. [Member]
    
Net capital 6,474,000,000 7,463,000,000
Amount of capital that exceeds the minimum required 5,309,000,000 6,355,000,000
Net capital, minimum amount required to hold 1,000,000,000  
Net capital, minimum amount required to hold in accordance with the market and credit risk standards 500,000,000  
Amount by which if net capital falls below, the company is required to notify the SEC $ 5,000,000,000