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Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of net benefit costs
U.S. Pension
Benefits
Non-U.S. Pension
Benefits
Other
Postretirement
Benefits
(Millions of dollars)

June 30June 30June 30
 202120202021202020212020
For the three months ended:      
Components of net periodic benefit cost:      
Service cost$— $— $15 $14 $25 $24 
Interest cost83 121 13 21 16 27 
Expected return on plan assets (179)(198)(33)(38)(1)(3)
Amortization of prior service cost (credit)— — — — (10)(10)
(Gain) loss on remeasurement of pension obligations 1
— 2 — 120 — — 
Curtailments, settlements and termination benefits 1
— — — 21 — — 
Net periodic benefit cost (benefit) 2
$(96)$(75)$(5)$138 $30 $38 
For the six months ended:
Components of net periodic benefit cost:
Service cost$— $— $29 $28 $50 $47 
Interest cost165 242 27 40 32 53 
Expected return on plan assets (358)(396)(65)(73)(3)(6)
Amortization of prior service cost (credit)— — — — (20)(19)
(Gain) loss on remeasurement of pension obligations 1
— 2 — (134)— — 
Curtailments, settlements and termination benefits 1
— — — 21 — — 
Net periodic benefit cost (benefit) 2
$(193)$(152)$(9)$(118)$59 $75 
1    Total lump-sum transfers out of certain pension plans exceeded the service and interest cost for 2020, which required us to follow settlement accounting and remeasure the plans' obligations as of March 31, 2020 and June 30, 2020.
2    The service cost component is included in Operating costs in the Consolidated Statement of Results of Operations. All other components are included in Other income (expense) in the Consolidated Statement of Results of Operations.
Company costs related to U.S. and non-U.S. defined contribution plans
Total company costs related to our defined contribution plans, which are included in Operating Costs in the Consolidated Statement of Results of Operations, were as follows:
 
 Three Months Ended June 30Six Months Ended June 30
(Millions of dollars)2021202020212020
U.S. Plans$115 $126 $240 $145 
Non-U.S. Plans28 20 54 43 
 $143 $146 $294 $188