v3.26.1
Related Party Transactions - Summary of Related Party Transactions (Income - Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income (Expense):        
Interest income $ 1,732 $ 1,908 $ 3,428 $ 3,788
Net interest income 549 523 1,101 1,049
Trading revenue (expense) 212 191 409 384
Servicing and other fees from HSBC affiliates:        
Gain (loss) on instruments designated at fair value and related derivatives (12) (1) (17) (4)
Support services from HSBC affiliates:        
Total support services from HSBC affiliates (483) (456) (943) (860)
Related Party        
Income (Expense):        
Interest income 85 76 165 147
Interest expense (186) (194) (367) (356)
Net interest income (101) (118) (202) (209)
Trading revenue (expense) (1,795) (2,049) (467) (2,533)
Servicing and other fees from HSBC affiliates:        
Gain (loss) on instruments designated at fair value and related derivatives 600 451 396 264
Support services from HSBC affiliates:        
Total support services from HSBC affiliates (483) (456) (943) (860)
Rental income from HSBC affiliates, net 13 11 26 23
HSBC Technology & Services (USA) Inc. ("HTSU")        
Support services from HSBC affiliates:        
Total support services from HSBC affiliates (259) (250) (512) (476)
HSBC Markets (USA) Inc. ("HMUS")        
Support services from HSBC affiliates:        
Total support services from HSBC affiliates (55) (64) (109) (119)
Other HSBC affiliates        
Support services from HSBC affiliates:        
Total support services from HSBC affiliates (169) (142) (322) (265)
Servicing and other fees from HSBC affiliates        
Servicing and other fees from HSBC affiliates:        
Other revenues 119 98 221 200
Servicing and other fees from HSBC affiliates | Related Party        
Servicing and other fees from HSBC affiliates:        
Other revenues 119 98 221 200
Servicing and other fees from HSBC affiliates | HSBC Bank plc        
Servicing and other fees from HSBC affiliates:        
Other revenues 67 57 125 124
Servicing and other fees from HSBC affiliates | HSBC Markets (USA) Inc. ("HMUS")        
Servicing and other fees from HSBC affiliates:        
Other revenues 26 24 48 42
Servicing and other fees from HSBC affiliates | Other HSBC affiliates        
Servicing and other fees from HSBC affiliates:        
Other revenues $ 26 $ 17 $ 48 $ 34