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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2017
HSBC North America Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]  
Components of Net Periodic Benefit Cost
 
Three Months Ended June 30,
 
Six Months Ended June 30,

2017
 
2016
 
2017
 
2016
 
(in millions)
Interest cost on projected benefit obligation
$
18

 
$
17

 
$
36

 
$
35

Expected return on plan assets
(22
)
 
(22
)
 
(43
)
 
(42
)
Amortization of net actuarial loss
8

 
9

 
18

 
19

Administrative costs
1

 
2

 
2

 
3

Pension expense
$
5

 
$
6

 
$
13

 
$
15

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,

2017
 
2016
 
2017
 
2016
 
(in millions)
Interest cost on accumulated benefit obligation
$

 
$

 
$
1

 
$
1

Net periodic postretirement benefit cost
$

 
$

 
$
1

 
$
1