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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Employee Benefit Plans
Note 15—Employee Benefit Plans
Pension and Postretirement Plans
Millions of Dollars
Pension Benefits
Other Benefits
2023202220232022
U.S.
Int'l.
U.S.
Int'l.
Components of Net Periodic Benefit Cost
Three Months Ended September 30
Service cost
$12 10 13 13 — — 
Interest cost
19 28 18 19 1 1 
Expected return on plan assets
(15)(38)(10)(31)— — 
Amortization of prior service credit
— — — (1)(9)(9)
Recognized net actuarial loss (gain)
3 16 6 2 (1)— 
Settlements
2 — 9 — — — 
Net periodic benefit cost
$21 16 36 2 (9)(8)
Nine Months Ended September 30
Service cost$38 29 45 39 — 1 
Interest cost
58 85 42 61 4 3 
Expected return on plan assets
(44)(112)(36)(99)— — 
Amortization of prior service credit
— — — (1)(28)(29)
Recognized net actuarial loss (gain)
9 50 17 6 (3)— 
Settlements
6 — 31 — — — 
Net periodic benefit cost$67 52 99 6 (27)(25)
The components of net periodic benefit cost, other than the service cost component, are included in the "Other expenses" line of our consolidated income statement.
During the first nine months of 2023, we contributed $126 million to our domestic benefit plans and $51 million to our international benefit plans. We expect our total contributions in 2023 to be approximately $135 million to our domestic qualified and nonqualified pension and postretirement benefit plans and $60 million to our international qualified and nonqualified pension and postretirement benefit plans.