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Pension and Other Postretirement Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2020
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 September 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202020192020201920202019
Service cost$1 $$1 $$1 $
Interest cost25 30 4 1 
Expected return on plan assets(42)(44)(7)(6) — 
Amortization:
Actuarial loss15 11 3  — 
Prior service credit (1) — (12)(2)
Settlement and curtailment (gain) loss 10 1 —  — 
Net periodic benefit cost (credit)$(1)$$2 $$(10)$
Nine Months Ended September 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202020192020201920202019
Service cost$2 $$4 $$4 $
Interest cost74 92 13 17 7 12 
Expected return on plan assets(124)(133)(22)(21) — 
Amortization:
Actuarial loss46 35 9  — 
Prior service credit (2) — (16)(7)
Settlement and curtailment (gain) loss 10 1 (4)(7)
Net periodic benefit cost (credit)$(2)$$5 $$(9)$
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 September 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202020192020201920202019
Operating profit (loss)$1 $$1 $$1 $
Interest and sundry (income) expense(2)1 (11)
Net periodic benefit cost$(1)$$2 $$(10)$
Nine Months Ended September 30,
United States
Pension Benefits
Foreign
Pension Benefits
Other Postretirement
Benefits
Millions of dollars202020192020201920202019
Operating profit (loss)$2 $$4 $$4 $
Interest and sundry (income) expense(4)1 (13)(2)
Net periodic benefit cost$(2)$$5 $$(9)$