Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Investment in subsidiaries:
Other assets	[1]	$ 6,490		$ 6,754
Total assets		168,238	[1]	164,655	[1]	$ 189,232
Liabilities:
Interest, taxes and other liabilities (includes $10 million and $325 million designated under fair value option at December 31, 2023 and 2022, respectively)	[1]	3,256		2,980
Total liabilities	[1]	156,599		152,542
Total equity		11,639		12,113		$ 17,040
Total liabilities and equity		168,238		164,655
HSBC USA
Assets:
Securities held-to-maturity (fair value of $1 million at both December 31, 2023 and 2022)		1		1
Receivables and balances due from subsidiaries		14,437		13,605
Receivables and balances due from other HSBC affiliates		2,663		3,519
Investment in subsidiaries:
Banking		15,527		15,941
Other		99		62
Other assets		257		175
Total assets		32,984		33,303
Liabilities:
Interest, taxes and other liabilities (includes $10 million and $325 million designated under fair value option at December 31, 2023 and 2022, respectively)		83		58
Payables due to subsidiaries		7		23
Payables due to other HSBC affiliates		76		44
Short-term borrowings		5,440		4,818
Short-term borrowings due to subsidiaries		0		1,500
Long-term debt		9,240		8,748
Long-term debt due to other HSBC affiliates		6,499		5,999
Total liabilities		21,345		21,190
Total equity		11,639		12,113
Total liabilities and equity		$ 32,984		$ 33,303

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2023 and 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20232022(in millions)AssetsLoans, net$— $162 Other assets23 44 Total assets$23 $206 LiabilitiesInterest, taxes and other liabilities$17 $22 Total liabilities$17 $22