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Pension and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Plans PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
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 March 31,
United States
Pension Benefits		Foreign
Pension Benefits		Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Service cost$1 $1 $1 $2 $— $2 
Interest cost19 25 4 4 1 3 
Expected return on plan assets(39)(41)(9)(8)— — 
Amortization:
Actuarial loss17 15 5 3 — — 
Prior service credit— — — — (11)(2)
Settlement and curtailment (gain) loss— — — — — — 
Net periodic benefit cost (credit)$(2)$— $1 $1 $(10)$3 
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 March 31,
United States
Pension Benefits		Foreign
Pension Benefits		Other Postretirement
Benefits
Millions of dollars202120202021202020212020
Operating profit (loss)$1 $1 $1 $2 $— $2 
Interest and sundry (income) expense(3)(1)— (1)(10)1 
Net periodic benefit cost$(2)$— $1 $1 $(10)$3 

401(k) Defined Contribution Plan

During March 2020, we announced that the company matching contributions for our 401(k) defined contribution plan, equal to up to 7% of participants' eligible compensation, covering substantially all U.S. employees, would be contributed in company stock starting from May 2020. As of January 1, 2021, we have resumed funding our matching contributions with cash.