Litigation and Regulatory Matters - Additional Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014 lawsuit
Loss Contingencies [Line Items]
Estimate of loss	$ 1,400
Number of opt-out suits filed	35
Number of opt-out suits naming HSBC defendants	1
Lopez v. HSBC USA, N.A., et.al. [Member]
Loss Contingencies [Line Items]
Estimate of loss	$ 32

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant