Related Party Transactions - Summary of Assets (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Due from Affiliates	$ 5,080,000,000	$ 5,328,000,000
HSBC Finance Corporation [Member]
Related Party Transaction [Line Items]
Due from Affiliates	3,014,000,000	3,015,000,000
HMUS [Member]
Related Party Transaction [Line Items]
Due from Affiliates	720,000,000	199,000,000
Loan And Lease Receivable Revolving Line Of Credit Outstanding	720,000,000	199,000,000
HSBC Bank Brasil [Member]
Related Party Transaction [Line Items]
Loan And Lease Receivable Revolving Line Of Credit Outstanding	1,100,000,000	1,000,000,000
Other Affiliates [Member]
Related Party Transaction [Line Items]
Loan And Lease Receivable Revolving Line Of Credit Outstanding	$ 246,000,000	$ 1,114,000,000