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Postretirement benefit plans
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Postretirement benefit plans Postretirement benefit plans
Expenses related to defined benefit and retiree health care benefit plans are as follows:
U.S. Defined BenefitU.S. Retiree Health CareNon-U.S. Defined Benefit
For Three Months Ended September 30,202520242025202420252024
Service cost$1 $2 $— $— $4 $4 
Interest cost6 7 3 4 16 15 
Expected return on plan assets(3)(7)(2)(4)(20)(22)
Recognized net actuarial losses (gains)1 1 — (1)1 3 
Amortization of prior service cost (credit)— — — — — 1 
Net periodic benefit costs (credits)5 3 1 (1)1 1 
Settlement losses4 — — — — — 
Total, including other postretirement losses (gains)$9 $3 $1 $(1)$1 $1 
U.S. Defined BenefitU.S. Retiree Health CareNon-U.S. Defined Benefit
For Nine Months Ended September 30,202520242025202420252024
Service cost$5 $6 $1 $1 $11 $12 
Interest cost19 19 9 10 45 42 
Expected return on plan assets(13)(18)(8)(13)(55)(60)
Recognized net actuarial losses (gains)5 3 (1)(2)3 9 
Amortization of prior service cost (credit)— — — — — 1 
Net periodic benefit costs (credits)16 10 1 (4)4 4 
Settlement losses7 — — — — — 
Total, including other postretirement losses (gains)$23 $10 $1 $(4)$4 $4