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Related Party Transactions - Summary of Related Party Transactions (Income - Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Related Party Transaction [Line Items]    
Interest income $ 612 $ 701
Interest expense (135) (170)
Net interest income 477 531
Trading revenue 72 41
Servicing and other fees from HSBC affiliates:    
Gain (loss) on instruments designated at fair value and related derivatives 6 18
Support services from HSBC affiliates:    
Total support services from HSBC affiliates (418) (367)
Affiliated Entity    
Related Party Transaction [Line Items]    
Interest income 6 7
Interest expense (52) (73)
Net interest income (46) (66)
Trading revenue 1,275 131
Servicing and other fees from HSBC affiliates:    
Gain (loss) on instruments designated at fair value and related derivatives (396) 468
Support services from HSBC affiliates:    
Total support services from HSBC affiliates (418) (367)
Rental income from HSBC affiliates, net 10 13
Stock based compensation expense (4) (6)
HSBC Markets (USA) Inc. (HMUS) and subsidiaries [Member]    
Support services from HSBC affiliates:    
Total support services from HSBC affiliates (37) (28)
Other HSBC affiliates    
Support services from HSBC affiliates:    
Total support services from HSBC affiliates (121) (95)
HSBC Technology and Services (USA) (HTSU) [Member]    
Support services from HSBC affiliates:    
Total support services from HSBC affiliates (260) (244)
Servicing and other fees from HSBC affiliates    
Servicing and other fees from HSBC affiliates:    
Other revenues 101 83
Servicing and other fees from HSBC affiliates | Affiliated Entity    
Servicing and other fees from HSBC affiliates:    
Other revenues 101 83
Servicing and other fees from HSBC affiliates | HSBC Bank plc [Member]    
Servicing and other fees from HSBC affiliates:    
Other revenues 60 48
Servicing and other fees from HSBC affiliates | HSBC Markets (USA) Inc. (HMUS) and subsidiaries [Member]    
Servicing and other fees from HSBC affiliates:    
Other revenues 25 22
Servicing and other fees from HSBC affiliates | Other HSBC affiliates    
Servicing and other fees from HSBC affiliates:    
Other revenues $ 16 $ 13