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Retirement Programs
 3 Months Ended
Mar. 31, 2022
Retirement Benefits, Description [Abstract]  
Retirement Programs Retirement Programs
The components of net pension and postretirement benefits other than pensions (“OPEB”) costs for the three months ended March 31, 2022 and 2021 are shown below:
 Quarter Ended March 31,
(Millions of dollars)20222021
Amount recognized in Operating Profit
Service cost$33 $40 
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost53 39 
Expected return on plan assets(136)(131)
Net amortization and deferral19 43 
(64)(49)
 Net periodic benefit cost (benefit)$(31)$(9)
Components of net periodic benefit expense for other post-retirement plans for the three months ended March 31, 2022 and 2021 were not material.
Linde estimates that 2022 required contributions to its pension plans will be in the range of $40 million to $50 million, of which $13 million have been made through March 31, 2022.