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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2024
Related Party Transactions [Abstract]  
Summary of Related Party Transactions The following tables and discussions below present the more significant related party balances and the income (expense) generated by related party transactions:
At December 31,20242023
 (in millions)
Assets:
Cash and due from banks$188 $133 
Interest bearing deposits with banks4 90 
Securities purchased under agreements to resell(1)
405 406 
Trading assets120 57 
Loans5,449 2,618 
Other(2)
468 491 
Total assets$6,634 $3,795 
Liabilities:
Deposits$8,351 $9,110 
Trading liabilities77 321 
Short-term borrowings1,549 1,014 
Long-term debt8,388 6,511 
Other(2)
252 331 
Total liabilities$18,617 $17,287 
(1)Reflects purchases of securities under which other HSBC affiliates have agreed to repurchase.
(2)Other assets and other liabilities primarily consist of derivative balances associated with hedging activities and other miscellaneous account receivables and payables. Other assets also includes receivables from HSBC Bank plc associated with certain client share repurchase transactions.
Year Ended December 31,202420232022
 (in millions)
Income (Expense):
Interest income$247 $223 $116 
Interest expense(564)(501)(298)
Net interest expense(317)(278)(182)
Trading revenue (expense)(1,070)(3,287)1,753 
Servicing and other fees from HSBC affiliates:
HSBC Bank plc209 180 190 
HSBC Markets (USA) Inc. ("HMUS")102 81 76 
Other HSBC affiliates74 66 77 
Total servicing and other fees from HSBC affiliates385 327 343 
Gain (loss) on instruments designated at fair value and related derivatives222 936 (1,256)
Support services from HSBC affiliates:
HTSU(942)(952)(1,018)
HMUS(233)(230)(191)
Other HSBC affiliates(495)(489)(553)
Total support services from HSBC affiliates(1,670)(1,671)(1,762)
Rental income from HSBC affiliates(1)
50 33 39 
Stock based compensation expense(2)
(28)(19)(15)
(1)We receive rental income from our affiliates for certain office space, which is recorded as a component of occupancy expense, net in our consolidated statement of income.
(2)Employees may participate in one or more stock compensation plans sponsored by HSBC. These expenses are included in salaries and employee benefits in our consolidated statement of income. Certain employees are also eligible to participate in a defined benefit pension plan and other postretirement plans sponsored by HSBC North America which are discussed in Note 22, "Pension and Other Postretirement Benefits."
Schedule of Loan Balances Outstanding with Affiliates
At December 31, 2024 and 2023, we had the following loan balances outstanding with HSBC affiliates:
At December 31,20242023
 (in millions)
HMUS and subsidiaries$2,013 $1,318 
HSBC North America
3,000 1,300 
Other short-term affiliate lending436 — 
Total loans$5,449 $2,618