Litigation and Regulatory Matters - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	36 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2007	Dec. 31, 2016
Loss Contingencies [Line Items]
Estimate of loss	$ 340,000,000	$ 340,000,000
Monteleone v. HSBC Finance Corporation, et al. [Member]
Loss Contingencies [Line Items]
Damages sought, per violation		1,500
HSBC Securities [Member] | Mortgage Securitization Activity Related Litigation [Member]
Loss Contingencies [Line Items]
Mortgage securitization loan purchased and sold			$ 24,000,000,000
Mortgage securitization outstanding loan purchase and sold	4,500,000,000	$ 4,500,000,000		$ 4,600,000,000
Consumer Relief [Member] | Foreclosure Practices [Member]
Loss Contingencies [Line Items]
Litigation settlement	$ 370,000,000