Related Party Transactions - Schedule of due to Affiliated entities (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Due to affiliates	$ 4,936	$ 6,945
Due to affiliate, carried at fair value	505	512
HSBC Private Banking Holdings (Suisse) S.A and subsidiaries [Member]
Related Party Transaction [Line Items]
Due to affiliates	500	2,500
HSBC USA, Inc. [Member]
Related Party Transaction [Line Items]
Due to affiliates	3,012	3,012
HSBC Holdings plc [Member]
Related Party Transaction [Line Items]
Due to affiliates	824	833
HSBC North America [Member]
Related Party Transaction [Line Items]
Due to affiliates	$ 600	$ 600

Carrying amount as of the balance sheet date of obligations due all related parties.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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