Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2019

HSBC North America Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]

Components of Net Periodic Benefit Cost

The table below reflects the portion of pension expense and its related components of the combined HSBC North America Pension Plan (either the "HSBC North America Pension Plan" or the "Plan") which has been allocated to us and is recorded in our consolidated statement of income. We have not been allocated any portion of the Plan's net pension liability.

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(in millions)
Interest cost on projected benefit obligation	$	14		$	15		$	29		$	30
Expected return on plan assets	(19		)	(19		)	(37		)	(40		)
Amortization of net actuarial loss	5			5			12			10
Administrative costs	1			1			2			2
Pension expense	$	1		$	2		$	6		$	2

Postretirement Plans Other Than Pensions [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]

Components of Net Periodic Benefit Cost

The following table reflects the components of the net periodic postretirement benefit cost:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019			2018		2019			2018
	(in millions)
Interest cost on accumulated benefit obligation	$	1		$	1	$	1		$	1
Amortization of net actuarial gain	(1		)	—		(1		)	—
Net periodic postretirement benefit cost	$	—		$	1	$	—		$	1