Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Investment in subsidiaries:
Other assets	[1]	$ 5,439		$ 6,084
Total assets		189,232	[1]	196,434	[1]	$ 175,375
Liabilities:
Interest, taxes and other liabilities	[1]	2,411		2,665
Total liabilities	[1]	172,192		178,143
Total equity		17,040		18,291		$ 18,256
Total liabilities and equity		189,232		196,434
HSBC USA
Assets:
Securities held-to-maturity, net of allowance for credit losses of less than $1 million at both December 31, 2021 and 2020 (fair value of $1 million and $2 million at December 31, 2021 and 2020, respectively)		1		2
Receivables and balances due from subsidiaries		12,944		14,585
Receivables from other HSBC affiliates		2,623		1,276
Investment in subsidiaries:
Banking		20,672		21,897
Other		75		12
Other assets		153		182
Total assets		36,468		37,954
Liabilities:
Interest, taxes and other liabilities		48		85
Payables due to subsidiaries		72		4
Payables due to other HSBC affiliates		65		32
Short-term borrowings		3,683		2,998
Short-term borrowings due to subsidiaries		1,500		3,000
Long-term debt		8,561		10,695
Long-term debt due to other HSBC affiliates		5,499		2,849
Total liabilities		19,428		19,663
Total equity		17,040		18,291
Total liabilities and equity		$ 36,468		$ 37,954

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2021 and 2020. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20212020(in millions)AssetsLoans$46 $10 Other assets55 79 Total assets$101 $89 LiabilitiesInterest, taxes and other liabilities$9 $10 Total liabilities$9 $10