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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
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 March 31,
2020
 
2019
 
(in millions)
Interest cost on projected benefit obligation
$
12

 
$
15

Expected return on plan assets
(19
)
 
(18
)
Amortization of net actuarial loss
2

 
7

Administrative costs
1

 
1

Pension (income) expense
$
(4
)
 
$
5