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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
Defined Benefit Pension Plan The following table 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 (loss). We have not been allocated any portion of the Plan's net pension asset.
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
 (in millions)
Interest cost on projected benefit obligation$11 $11 $32 $35 
Expected return on plan assets(15)(14)(44)(53)
Amortization of net actuarial loss— — — 4 
Administrative costs1 1 3 3 
Pension (income) expense$(3)$(2)$(9)$(11)
Postretirement Plans Other Than Pensions  Certain employees also participate in plans which provide medical and life insurance benefits to retirees and eligible dependents. These plans cover all eligible employees who meet certain age and vested service requirements. We have instituted dollar limits on payments under the plans to control the cost of future medical benefits. Net periodic postretirement benefit cost was less than $1 million during the three and nine months ended September 30, 2021 and 2020.