Financial Statements of HSBC USA Inc. (Parent) Statement of Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income:
Total income	$ 3,890	$ 2,899	$ 3,771
Expenses:
Other interest expense	11	16	35
Provision for credit losses	(437)	736	195
Income tax expense (benefit)	224	(42)	157
Net income (loss)	688	(940)	113
Other comprehensive income (loss)	(858)	956	87
Comprehensive income (loss)	(170)	16	200
HSBC USA
Income:
Dividends from banking subsidiaries	102	121	138
Interest from subsidiaries	28	101	350
Interest from other HSBC affiliates	23	43	91
Other income from subsidiaries	0	0	2
Other income from other HSBC Affiliates	1,027	552	1,645
Other income (loss)	(1,023)	(544)	(1,690)
Total income	157	273	536
Expenses:
Interest to subsidiaries	16	6	0
Interest to other HSBC Affiliates	128	115	140
Other interest expense	40	228	549
Provision for credit losses	0	(1)	0
Other expenses with subsidiaries	19	15	12
Other expenses	1	3	5
Total expenses	204	366	706
Income (loss) before income tax	(47)	(93)	(170)
Income tax expense (benefit)	(33)	(50)	(78)
Loss before equity in undistributed income (loss) of subsidiaries	(14)	(43)	(92)
Equity in undistributed income (loss) of subsidiaries	702	(897)	205
Net income (loss)	688	(940)	113
Other comprehensive income (loss)	(858)	956	87
Comprehensive income (loss)	$ (170)	$ 16	$ 200