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Related Party Transactions - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Residential Mortgage [Member]
Dec. 31, 2011
Residential Mortgage [Member]
Sep. 30, 2012
HSBC Finance [Member]
Sep. 30, 2011
HSBC Finance [Member]
Sep. 30, 2012
HSBC Finance [Member]
Sep. 30, 2011
HSBC Finance [Member]
Dec. 31, 2011
HSBC Finance [Member]
Sep. 30, 2012
HSBC Finance [Member]
Credit Card Customer Relationship [Member]
Mar. 29, 2012
HSBC Finance [Member]
Credit Card Customer Relationship [Member]
Sep. 30, 2011
HSBC Finance [Member]
Credit Card Receivables [Member]
Sep. 30, 2012
HSBC Finance [Member]
Credit Card Receivables [Member]
Sep. 30, 2011
HSBC Finance [Member]
Credit Card Receivables [Member]
Dec. 31, 2011
HSBC Finance [Member]
Credit Card Receivables [Member]
Sep. 30, 2012
HSBC Finance [Member]
Extended committed revolving credit facility [Member]
May 31, 2012
HSBC Finance [Member]
Extended committed revolving credit facility [Member]
Sep. 30, 2012
HSBC Finance [Member]
Extended uncommitted revolving credit facility
Jun. 30, 2012
HSBC Finance [Member]
Extended uncommitted revolving credit facility
Sep. 30, 2012
HSBC Finance [Member]
Extended uncommitted revolving credit facility
Dec. 31, 2011
HSBC Finance [Member]
Extended uncommitted revolving credit facility
Sep. 30, 2012
HMUS [Member]
Sep. 30, 2011
HMUS [Member]
Sep. 30, 2012
HMUS [Member]
Sep. 30, 2011
HMUS [Member]
Dec. 31, 2011
HMUS [Member]
Jan. 31, 2011
Halbis Capital Management (USA) [Member]
Apr. 30, 2012
Halbis Capital Management (USA) [Member]
European Banknotes Business [Member]
Sep. 30, 2012
HNAH [Member]
Sep. 30, 2011
HNAH [Member]
Sep. 30, 2012
HNAH [Member]
Sep. 30, 2011
HNAH [Member]
Dec. 31, 2011
HNAH [Member]
Apr. 30, 2011
HNAH [Member]
Aug. 31, 2009
HNAH [Member]
Sep. 30, 2012
Other Affiliates [Member]
Sep. 30, 2011
Other Affiliates [Member]
Sep. 30, 2012
Other Affiliates [Member]
Sep. 30, 2011
Other Affiliates [Member]
Dec. 31, 2011
Other Affiliates [Member]
Sep. 30, 2012
HSBC France [Member]
Dec. 31, 2011
HSBC France [Member]
Sep. 30, 2012
HSBC Investment [Member]
Sep. 30, 2012
HSBC North America Inc. [Member]
Dec. 31, 2011
HSBC North America Inc. [Member]
Sep. 30, 2012
HSBC Finance and other HSBC Affiliates [Member]
Dec. 31, 2011
HSBC Finance and other HSBC Affiliates [Member]
Sep. 30, 2012
HSBC Global Resourcing [Member]
Sep. 30, 2011
HSBC Global Resourcing [Member]
Sep. 30, 2012
HSBC Global Resourcing [Member]
Sep. 30, 2011
HSBC Global Resourcing [Member]
Related Party Transaction [Line Items]                                                                                                      
Credit card receivables                   $ 970,000,000 $ 108,000,000                                                                                
Credit card receivables purchased            8,100,000,000 9,900,000,000 23,700,000,000       582,000,000 492,000,000 1,700,000,000                                                                          
Credit card servicing                             1,200,000,000                                                                        
Fee for servicing credit cards           4,000,000 7,000,000 11,000,000                                                                                      
Residential mortgage loans purchased 3,700,000,000                                                                                                    
Residential mortgage loans servicing     1,200,000,000 1,300,000,000                                                                                              
Residential mortgage loans servicing fees         1,000,000 1,000,000 3,000,000 3,000,000                                                                                      
Services fee paid         2,000,000 2,000,000 5,000,000 5,000,000                                                                                      
Services fee received         1,000,000 3,000,000 3,000,000 7,000,000                                                                                      
Service revenue received against employee work for main bank         14,000,000   42,000,000                                                                                        
Service revenue received against employee work for main bank last year           15,000,000   47,000,000                                                                                      
Extended secured uncommitted credit facility and loans and lines of credit             1,500,000,000                                 2,800,000,000   2,800,000,000                                                  
Extended secured uncommitted credit facility to certain subsidiary (In days)             364 days                                                                                        
Extended line of credit                                 2,000,000,000       3,000,000,000                                                            
Extended unsecured uncommitted credit facility to certain subsidiary maturity                                         15 years                                                            
Amendment for increase extended unsecured uncommitted credit facility to certain subsidiary                                     4,000,000,000                                                                
Amount outstanding under the loan agreement                               0   512,000,000   512,000,000                                                              
Interest income received                                   1,000,000   1,000,000                                                              
Purchase of Portfolios with an outstanding principal             12,400,000,000                                                                                        
Net premium of outstanding principal 113,000,000                                                                                                    
Fees paid for servicing of components of income from discontinued operation           149,000,000 199,000,000 447,000,000                                                                                      
Line of Credit         1,000,000,000   1,000,000,000                                                                                        
Line of credit amount outstanding                 0                                                     0   0   0                      
Extended unsecured credit facility 1,000,000,000                                                                                                    
Extended line of credit amount outstanding   0                                                                                                  
Loans and lines of credit amount outstanding                                           270,000,000   270,000,000   229,000,000                                                  
Loans and lines of credit interest income                                           1,000,000 1,000,000 3,000,000 5,000,000                                                    
Increase in additional paid-in-capital                                                     21,000,000                                                
Sale of our European Banknotes Business with assets   21,454,000,000                                                   123,000,000                                              
Senior notes                                                                   3,000,000,000 1,000,000,000                                
Notes mature installments period one                                                         1,000,000,000   1,000,000,000                                        
Notes mature installments period two                                                         1,000,000,000   1,000,000,000                                        
Notes mature installments period three                                                         1,000,000,000   1,000,000,000                                        
Senior note floating rate period                                                             Notes bear interest at 90 day USD Libor plus a spread                                        
Senior note interest rate period                                                             90 days                                        
Interest expense on notes                                                         16,000,000 14,000,000 49,000,000 31,000,000                                      
Marketable securities                                                         15,000,000   15,000,000   8,500,000,000                                    
Notional value of credit derivatives transactions 526,000,000,000 657,300,000,000                                                                   45,900,000,000   45,900,000,000   45,100,000,000                      
Derivative Liabilities                                                                       1,200,000,000   1,200,000,000   1,000,000,000                      
Loan and lease receivable unused line of credit facility                                                                                   2,500,000,000 500,000,000 150,000,000 150,000,000            
Loan and lease receivable unused line of credit facility termination date                                                                                 Jul. 30, 2012                    
Extended loans and lines of credit                                                                       460,000,000   460,000,000   460,000,000                      
Loans and lines of credit interest income                                                                       0 0 0 0                        
Notional value of interest rate derivative 3,176,200,000,000 2,782,600,000,000                                                                                       1,023,000,000,000 887,000,000,000        
Fair value of derivative receivables                                                                                           22,700,000,000 22,400,000,000        
Expense of stock compensation plans on a pre-tax basis                                                                       7,000,000 14,000,000 27,000,000 38,000,000                        
Support services expense                                                                                               5,000,000   18,000,000  
Prior year professional and contract services expense                                                                                                 $ 7,000,000   $ 21,000,000