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Regulatory Requirements - U.S. Broker-Dealer Regulatory Capital Requirements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
MS&Co.    
Regulatory Requirements    
Net capital $ 13,358 $ 13,797
Excess net capital 10,453 11,333
MSSB LLC    
Regulatory Requirements    
Net capital 3,772 3,455
Excess net capital $ 3,634 $ 3,313