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