CONSOLIDATED STATEMENT OF INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans		$ 638	$ 716
Securities		243	304
Trading securities		80	63
Short-term investments		87	176
Other		19	18
Total interest income		1,067	1,277
Interest expense:
Deposits		321	333
Short-term borrowings		40	62
Long-term debt		198	312
Other		4	8
Total interest expense		563	715
Net interest income		504	562
Provision for credit losses		726
Provision for credit losses		512	58
Net interest income (expense) after provision for credit losses		(222)	504
Other revenues:
Other revenues		283	272
Trading revenue		14	133
Other securities gains, net		28	7
Loss on instruments designated at fair value and related derivatives		(22)	(9)
Other income (loss)		86	(11)
Total other revenues	[1]	387	390
Operating expenses:
Salaries and employee benefits		207	210
Support services from HSBC affiliates		382	380
Occupancy expense, net		140	45
Goodwill impairment		784	0
Other expenses		92	115
Total operating expenses		1,605	750
Income (loss) before income tax		(1,440)	144
Income tax expense (benefit)		(157)	35
Net income (loss)		(1,283)	109
Credit card fees, net [Member]
Other revenues:
Other revenues		11	12
Trust and investment management fees [Member]
Other revenues:
Other revenues		31	30
Other fees and commissions [Member]
Other revenues:
Other revenues		151	147
Servicing and other fees from HSBC affiliates [Member]
Other revenues:
Other revenues		$ 88	$ 81

[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.