Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Assets:
Interest bearing deposits with banks		$ 15,700		$ 11,157
Securities held-to-maturity (fair value of $2 million and $3 million at December 31, 2018 and 2017, respectively)		14,670		13,977
Investment in subsidiaries:
Other assets		6,325		7,129
Total assets		172,448	[1]	187,235	[1]	$ 201,301
Liabilities:
Interest, taxes and other liabilities		2,536		3,944
Short-term borrowings		4,180		4,650		5,101
Total liabilities	[1]	151,942		167,141
Total equity		20,506		20,094		$ 20,355
Total liabilities and equity		172,448		187,235
HSBC USA Inc [Member]
Assets:
Interest bearing deposits with banks		2		1
Securities held-to-maturity (fair value of $2 million and $3 million at December 31, 2018 and 2017, respectively)		2		2
Receivables and balances due from subsidiaries		15,593		14,536
Receivables from other HSBC affiliates		2,510		6,722
Investment in subsidiaries:
Banking		23,765		23,316
Other		1		1
Other assets		179		148
Total assets		42,052		44,726
Liabilities:
Interest, taxes and other liabilities		127		137
Payables due to subsidiaries		12		3
Payables due to other HSBC affiliates		12		22
Short-term borrowings		2,532		1,154
Long-term debt		16,017		22,474
Long-term debt due to subsidiary and other HSBC affiliates		2,846		842
Total liabilities		21,546		24,632
Total equity		20,506		20,094
Total liabilities and equity		$ 42,052		$ 44,726

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2018 and December 31, 2017 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 25, "Variable Interest Entities," for additional information. Assets: Other assets $112 million and $154 million. Total assets $112 million and $154 million respectively. Liabilities: Long-term debt $66 million and $73 million, Interest, taxes and other liabilities $37 million and $59 million. Total liabilities $103 million and $132 million, respectively.