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Regulatory Requirements (Significant U.S. Bank Operating Subsidiaries' Capital) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Total capital, amount $ 56,626 [1] $ 54,956 [1]
Tier 1 capital, amount 54,360 [1] 51,114 [1]
Tier 1 leverage capital, amount 0 [1] 0 [1]
Total capital to RWAs, ratio 18.50% [1] 17.50% [1]
Tier 1 capital to RWAs, ratio 17.70% [1] 16.20% [1]
Tier 1 leverage, ratio 7.10% [1] 6.60% [1]
Morgan Stanley Bank, N.A.
    
Total capital, amount 11,509 10,222
Tier 1 capital, amount 9,918 8,703
Tier 1 leverage capital, amount 9,918 8,703
Total capital to RWAs, ratio 17.20% 17.80%
Tier 1 capital to RWAs, ratio 14.90% 15.10%
Tier 1 leverage, ratio 13.30% 13.20%
Morgan Stanley Private Bank, National Association
    
Total capital, amount 1,673 1,278
Tier 1 capital, amount 1,665 1,275
Tier 1 leverage capital, amount $ 1,665 $ 1,275
Total capital to RWAs, ratio 28.80% 31.90%
Tier 1 capital to RWAs, ratio 28.70% 31.80%
Tier 1 leverage, ratio 10.60% 10.20%
[1] The Company’s December 31, 2011 Tier 1 common capital ratio, Tier 1 capital ratio and Total capital ratio were each reduced by approximately 30 basis points, and Tier 1 leverage ratio was reduced by approximately 20 basis points due to an approximate $1.2 billion deferred tax asset disallowance adjustment, which resulted in a reduction to the Company’s Tier 1 common capital, Tier 1 capital, Total capital, RWAs and adjusted average assets by such amount.