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Related Party Transactions - Summary of Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
HSBC Finance Corporation [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties $ 0 $ 2,501
HMUS [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties 1,192 563
Extended loans and lines of credit 5,900 5,900
HSBC Mexico [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties 0 195
Extended loans and lines of credit 1,200 1,200
Other Affiliates [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties 231 15
Extended loans and lines of credit 1,900  
Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties $ 1,423 $ 3,274