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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three and six months ended June 30, 2020 and 2019, were as follows:
 Millions of Dollars
 Pension BenefitsOther Benefits
 202020192020  2019  
U.S.Int’l.U.S.Int’l.
Components of Net Periodic Benefit Cost
Three Months Ended June 30
Service cost$34  7  31  6  2  2  
Interest cost24  5  27  7  1  2  
Expected return on plan assets(42) (12) (35) (12) —  —  
Amortization of prior service credit—  —  —  —  —  (1) 
Recognized net actuarial loss15  4  13  1  —  —  
Settlements39  —  2  —  —  —  
Net periodic benefit cost*$70  4  38  2  3  3  
Six Months Ended June 30
Service cost$67  14  63  12  3  3  
Interest cost49  11  54  13  3  4  
Expected return on plan assets(83) (25) (71) (23) —  —  
Amortization of prior service credit—  —  —  —  (1) (1) 
Recognized net actuarial loss29  8  26  3  —  —  
Settlements39  —  6  —  —  —  
Net periodic benefit cost*$101  8  78  5  5  6  
* Included in the “Operating expenses” and “Selling, general and administrative expenses” line items on our consolidated statement of operations.