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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Goodwill [Line Items]          
Goodwill impairment   $ 0us-gaap_GoodwillImpairmentLoss $ 616us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss  
Goodwill   1,612us-gaap_Goodwill 1,612us-gaap_Goodwill 2,228us-gaap_Goodwill 1,612us-gaap_Goodwill
Accumulated impairment loss   670us-gaap_GoodwillImpairedAccumulatedImpairmentLoss 670us-gaap_GoodwillImpairedAccumulatedImpairmentLoss   670us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Carrying value as a percent of fair value 65.00%hsbcusa_GoodwillFairValueasPercentageofFairValue        
Operating Segments [Member] | Gbm [Member]          
Goodwill [Line Items]          
Goodwill impairment         $ 616us-gaap_GoodwillImpairmentLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hsbcusa_GbmMember