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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jun. 30, 2015
Related Party Transaction [Line Items]              
Long-term debt (includes $10.0 billion and $9.2 billion designated under fair value option at September 30, 2016 and December 31, 2015, respectively) $ 39,500,000,000     $ 39,500,000,000   $ 33,509,000,000  
Derivative, notional amount 4,361,069,000,000     4,361,069,000,000   4,212,040,000,000  
Hnah [Member]              
Related Party Transaction [Line Items]              
Long-term debt (includes $10.0 billion and $9.2 billion designated under fair value option at September 30, 2016 and December 31, 2015, respectively) 5,900,000,000     5,900,000,000   1,900,000,000  
HSBC North America Inc. HNAI [Member]              
Related Party Transaction [Line Items]              
Maximum borrowing capacity 150,000,000     150,000,000      
Amount outstanding under the loan agreement 0     0   0  
HSBC Finance Corporation [Member]              
Related Party Transaction [Line Items]              
Loans and leases receivable from related parties 3,013,000,000     3,013,000,000   3,014,000,000  
HSBC Finance Corporation [Member] | Extended Uncommitted Revolving Credit Facility [Member]              
Related Party Transaction [Line Items]              
Extended loans and lines of credit 5,000,000,000.0     $ 5,000,000,000.0   5,000,000,000.0  
Debt term       364 days      
Maximum maturity for borrowings under uncommitted revolving credit agreement       5 years      
Amount outstanding on line of credit 3,000,000,000     $ 3,000,000,000   3,000,000,000  
Credit agreement, amount maturing September 2017 500,000,000     500,000,000      
Credit agreement amount maturing January 2018 1,500,000,000     1,500,000,000      
Credit agreement amount maturing September 2018 1,000,000,000     1,000,000,000      
HSBC Finance Corporation [Member] | Extended committed revolving credit facility [Member]              
Related Party Transaction [Line Items]              
Extended loans and lines of credit 1,000,000,000     1,000,000,000   1,000,000,000  
Amount outstanding on line of credit 0     0   0  
HMUS [Member]              
Related Party Transaction [Line Items]              
Loans and leases receivable from related parties 473,000,000     473,000,000   978,000,000  
Extended loans and lines of credit 8,900,000,000     8,900,000,000   10,700,000,000  
Amount outstanding on line of credit 473,000,000     473,000,000   978,000,000  
HSBC Mexico [Member]              
Related Party Transaction [Line Items]              
Loans and leases receivable from related parties 975,000,000     975,000,000   725,000,000  
Extended loans and lines of credit 1,200,000,000     1,200,000,000   1,200,000,000  
Other Affiliates [Member]              
Related Party Transaction [Line Items]              
Loans and leases receivable from related parties 2,000,000     2,000,000   40,000,000  
Extended loans and lines of credit 3,100,000,000     3,100,000,000      
Amount outstanding on line of credit 0     0   0  
Regency [Member]              
Related Party Transaction [Line Items]              
Loans and leases receivable from related parties [1] 0     0   58,000,000  
Notional amount of liquidity facilities           3,400,000,000  
Affiliated Entity [Member]              
Related Party Transaction [Line Items]              
Long-term debt (includes $10.0 billion and $9.2 billion designated under fair value option at September 30, 2016 and December 31, 2015, respectively) 5,832,000,000     5,832,000,000   1,827,000,000  
Loans and leases receivable from related parties 4,463,000,000     4,463,000,000   4,815,000,000  
Derivative, notional amount 979,100,000,000     979,100,000,000   1,004,100,000,000  
Fair value of derivative assets and liabilities 6,000,000     6,000,000   216,000,000  
Floating Rate Note Maturing December 2016 [Member] | Hnah [Member] | Senior debt [Member]              
Related Party Transaction [Line Items]              
Debt issued             $ 1,000,000,000
Floating Rate Note Maturing August 2021 [Member] | Hnah [Member] | Senior debt [Member]              
Related Party Transaction [Line Items]              
Debt issued 2,000,000,000     2,000,000,000      
Floating Rate Note Maturing May 2025 [Member] | Hnah [Member] | Subordinated Debt [Member]              
Related Party Transaction [Line Items]              
Debt issued             $ 900,000,000
Floating Rate Note Maturing August 2026 [Member] | Hnah [Member] | Senior debt [Member]              
Related Party Transaction [Line Items]              
Debt issued 2,000,000,000     2,000,000,000      
Residential Mortgage [Member] | HSBC Finance Corporation [Member]              
Related Party Transaction [Line Items]              
Carrying amount of residential mortgage loans 586,000,000     586,000,000   $ 696,000,000  
Support Services From Affiliates [Member] | Affiliated Entity [Member]              
Related Party Transaction [Line Items]              
Rent from related party $ 16,000,000   $ 15,000,000 $ 47,000,000 $ 44,000,000    
6.0 %, Non-Cumulative Series I Preferred Stock [Member] | Hnah [Member]              
Related Party Transaction [Line Items]              
HSBC USA preferred stock issued   $ 1,265,000,000          
HSBC USA preferred stock dividend rate (percent)   6.00%          
[1] An asset-backed commercial paper conduit consolidated by an HSBC affiliate.