Financial Statements of HSBC USA Inc. (Parent) Statement of Income (Loss) and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income:
Total income	$ 3,312	$ 3,510	$ 3,890
Expenses:
Other interest expense	47	30	11
Income tax expense (benefit)	95	177	224
Net income	393	548	688
Other comprehensive income (loss)	649	(2,396)	(858)
Comprehensive income (loss)	1,042	(1,848)	(170)
HSBC USA
Income:
Dividends from banking subsidiaries	1,940	143	102
Dividends from other subsidiaries	15	15	0
Interest from subsidiaries	526	101	28
Interest from other HSBC affiliates	194	89	23
Other income (loss) from subsidiaries	0	(1)	0
Other income (loss) from other HSBC Affiliates	951	(1,046)	1,027
Other income (loss)	(961)	998	(1,023)
Total income	2,665	299	157
Expenses:
Interest to subsidiaries	54	46	16
Interest to other HSBC Affiliates	172	140	128
Other interest expense	1,091	305	40
Other expenses with subsidiaries	13	15	19
Other expenses	2	2	1
Total expenses	1,332	508	204
Income before income tax	1,333	(209)	(47)
Income tax expense (benefit)	(143)	(88)	(33)
Income (loss) before equity in undistributed income (loss) of subsidiaries	1,476	(121)	(14)
Equity in undistributed income (loss) of subsidiaries	(1,083)	669	702
Net income	393	548	688
Other comprehensive income (loss)	649	(2,396)	(858)
Comprehensive income (loss)	$ 1,042	$ (1,848)	$ (170)