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Pension and Other Postretirement Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table summarizes the components of net periodic pension cost and the cost of other postretirement benefits for the periods presented:
Three Months Ended June 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Service cost$ $— $2 $$ $
Interest cost19 24 3 2 
Expected return on plan assets(40)(41)(8)(7) — 
Amortization:
Actuarial loss18 16 5  — 
Prior service credit —  — (12)(2)
Settlement and curtailment (gain) loss3 —  —  (4)
Net periodic benefit cost (credit)$ $(1)$2 $$(10)$(2)
Six Months Ended June 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Service cost$1 $$3 $$ $
Interest cost38 49 7 3 
Expected return on plan assets(79)(82)(17)(15) — 
Amortization:
Actuarial loss35 31 10  — 
Prior service credit —  — (23)(4)
Settlement and curtailment (gain) loss3 —  —  (4)
Net periodic benefit cost (credit)$(2)$(1)$3 $$(20)$
The following table summarizes the net periodic cost recognized in operating profit and interest and sundry (income) expense for the periods presented:
Three Months Ended June 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Operating profit (loss)$ $— $2 $$ $
Interest and sundry (income) expense (1) (10)(3)
Net periodic benefit cost$ $(1)$2 $$(10)$(2)
Six Months Ended June 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Operating profit (loss)$1 $$3 $$ $
Interest and sundry (income) expense(3)(2) — (20)(2)
Net periodic benefit cost$(2)$(1)$3 $$(20)$