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Related Party Transactions - Summary of Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Due from Affiliates $ 5,277 $ 5,328
HSBC Finance Corporation [Member]
   
Related Party Transaction [Line Items]    
Due from Affiliates 3,015 3,015
HMUS [Member]
   
Related Party Transaction [Line Items]    
Due from Affiliates 931 199
HSBC Bank Brasil [Member]
   
Related Party Transaction [Line Items]    
Due from Affiliates 1,000 1,000
Other Affiliates [Member]
   
Related Party Transaction [Line Items]    
Due from Affiliates $ 331 $ 1,114