v3.24.1.u1
Retirement Benefits (Tables)
3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Defined Benefit Plans - Expense
The pre-tax net periodic benefit cost/(income) for our defined benefit pension and OPEB plans for the periods ended March 31 were as follows (in millions):

First Quarter
20232024
 Pension BenefitsOPEBPension BenefitsOPEB
 U.S. PlansNon-U.S. PlansWorldwide U.S. PlansNon-U.S. PlansWorldwide
Service cost$72 $61 $5 $73 $63 $6 
Interest cost408 237 58 400 235 57 
Expected return on assets(486)(219)— (455)(255)— 
Amortization of prior service costs/(credits)
— 5 1 23 6 2 
Net remeasurement (gain)/loss113 — — — (11)— 
Separation programs/other2 4 — 8 14 — 
Settlements and curtailments
42 — — — — — 
Net periodic benefit cost/(income)
$151 $88 $64 $49 $52 $65