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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
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)