CONSOLIDATED STATEMENT OF INCOME - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Interest income:
Loans		$ 743	$ 637	$ 1,459		$ 1,235
Securities		298	278	602		531
Trading securities		67	53	130		102
Short-term investments		173	157	349		315
Other		20	22	38		38
Total interest income		1,301	1,147	2,578		2,221
Interest expense:
Deposits		380	258	713		480
Short-term borrowings		68	43	130		76
Long-term debt		306	283	618		540
Other		7	8	15		18
Total interest expense		761	592	1,476		1,114
Net interest income		540	555	1,102		1,107
Provision for credit losses		46	(45)	104		(116)
Net interest income after provision for credit losses		494	600	998		1,223
Other revenues:
Other revenues		303	323	575		634
Trading revenue		123	192	256		355
Other securities gains, net		23	10	30		15
Gain (loss) on instruments designated at fair value and related derivatives		(17)	4	(26)		34
Other income (loss)		8	11	(3)		18
Total other revenues	[1]	436	537	826	[2]	1,050	[2]
Operating expenses:
Salaries and employee benefits		221	212	431		419
Support services from HSBC affiliates		411	405	791		816
Occupancy expense, net		48	45	93		88
Other expenses		94	124	209		745
Total operating expenses	[2]	774	786	1,524		2,068	[3]
Income before income tax		156	351	300		205
Income tax expense		35	82	70		174
Net income		121	269	230		31
Credit card fees, net [Member]
Other revenues:
Other revenues		18	15	30		26
Trust and investment management fees [Member]
Other revenues:
Other revenues		31	34	61		72
Other fees and commissions [Member]
Other revenues:
Other revenues		162	184	309		344
Servicing and other fees from HSBC affiliates [Member]
Other revenues:
Other revenues		$ 88	$ 87	$ 169		$ 186

[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.

[2] Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis.

[3] Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.