CONSOLIDATED STATEMENT OF INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Loans		$ 511	$ 733	$ 1,729	$ 2,192
Securities		202	296	707	898
Trading securities		64	85	192	215
Short-term investments		16	136	126	485
Other		11	23	35	61
Total interest income		804	1,273	2,789	3,851
Interest expense:
Deposits		135	408	656	1,121
Short-term borrowings		7	79	62	209
Long-term debt		111	277	471	895
Other		3	6	10	21
Total interest expense		256	770	1,199	2,246
Net interest income		548	503	1,590	1,605
Provision for credit losses		(105)		840
Provision for credit losses		(75)	94	774	198
Net interest income after provision for credit losses		653	409	750	1,407
Other revenues:
Other revenues		269	298	814	873
Trading revenue		49	178	255	434
Other securities gains, net		52	46	111	76
Gain (loss) on instruments designated at fair value and related derivatives		15	(19)	15	(45)
Other income (loss)		(27)	(14)	18	(17)
Total other revenues	[1]	356	486	1,207	1,312
Operating expenses:
Salaries and employee benefits		193	195	590	626
Support services from HSBC affiliates		391	394	1,162	1,185
Occupancy expense, net		44	41	222	134
Goodwill impairment		0	365	784	365
Other expenses		157	111	359	320
Total operating expenses		785	1,106	3,117	2,630
Income (loss) before income tax		224	(211)	(1,160)	89
Income tax expense (benefit)		36	39	(72)	109
Net income (loss)		188	(250)	(1,088)	(20)
Credit card fees, net [Member]
Other revenues:
Other revenues		10	18	30	48
Trust and investment management fees [Member]
Other revenues:
Other revenues		34	34	98	95
Other fees and commissions [Member]
Other revenues:
Other revenues		144	155	425	464
Servicing and other fees from HSBC affiliates [Member]
Other revenues:
Other revenues		$ 79	$ 88	$ 255	$ 257

[1] See Note 15, "Business Segments," for a reconciliation of total other revenues on a U.S. GAAP basis to other operating income for each business segment under the Group Reporting Basis.