Related Party Transactions - Schedule of due to Affiliated entities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Due to affiliate, carried at fair value	$ 496	$ 514
Due to affiliates	8,742	9,089
HSBC Private Banking Holdings (Suisse) S.A and subsidiaries [Member]
Related Party Transaction [Line Items]
Due to affiliates	4,300	5,625
HSBC USA, Inc. [Member]
Related Party Transaction [Line Items]
Due to affiliates	3,012	2,012
HSBC Holdings pcl [Member]
Related Party Transaction [Line Items]
Due to affiliates	820	842
HSBC North America [Member]
Related Party Transaction [Line Items]
Due to affiliates	600	600
HSBC Asia [Member]
Related Party Transaction [Line Items]
Due to affiliates	$ 10	$ 10