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Pension and Other Postretirement Benefits (Tables)
12 Months Ended
Dec. 31, 2017
HSBC North America Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]  
Components of Net Periodic Benefit Cost
Year Ended December 31,
2017
 
2016
 
2015
 
(in millions)
Interest cost on projected benefit obligation
$
71

 
$
70

 
$
70

Expected return on plan assets
(88
)
 
(86
)
 
(90
)
Amortization of net actuarial loss
33

 
42

 
38

Administrative costs
4

 
4

 
5

Loss on partial settlement of Plan pension obligation
35

 

 

Pension expense
$
55

 
$
30

 
$
23

Schedule of Assumptions Used [Table Text Block]
The assumptions used in determining pension expense of the HSBC North America Pension Plan are as follows:
 
2017
 
2016
 
2015
Discount rate
3.60
%
 
4.25
%
 
3.95
%
Expected long-term rate of return on Plan assets
5.50

 
5.50

 
6.00

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:
Year Ended December 31,
2017
 
2016
 
2015
 
(in millions)
Interest cost on accumulated benefit obligation
$
2

 
$
2

 
2

Amortization of net actuarial gain
(1
)
 

 

Net periodic postretirement benefit cost
$
1

 
$
2

 
$
2

Schedule of Assumptions Used [Table Text Block]
The assumptions used in determining the net periodic postretirement benefit cost for our postretirement benefit plans are as follows:
 
2017
 
2016
 
2015
Discount rate
3.95
%
 
3.95
%
 
3.60
%
Salary increase assumption
3.00

 
3.00

 
3.00

The assumptions used in determining the benefit obligation of our postretirement benefit plans at December 31 are as follows:
 
2017
 
2016
 
2015
Discount rate
3.45
%
 
3.95
%
 
3.95
%
Salary increase assumption
3.00

 
3.00

 
3.00

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]
A reconciliation of the beginning and ending balances of the accumulated postretirement benefit obligation is as follows:
 
2017
 
2016
 
(in millions)
Accumulated benefit obligation at beginning of year
$
55

 
$
60

Interest cost
2

 
2

Actuarial losses (gains)

 
(3
)
Benefits paid, net
(4
)
 
(4
)
Accumulated benefit obligation at end of year
$
53

 
$
55

Schedule of Expected Benefit Payments [Table Text Block]
Estimated future benefit payments for our postretirement benefit plans are summarized in the following table:
  
(in millions)
2018
$
4

2019
4

2020
4

2021
4

2022
4

2023-2027
18