Related Party Transactions - Schedule of due to Affiliated entities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Due to affiliates	$ 5,925	$ 6,945
Due to affiliate, carried at fair value	496	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	813	833
HSBC North America [Member]
Related Party Transaction [Line Items]
Due to affiliates	$ 1,600	$ 600