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Postretirement benefit plans
 6 Months Ended
Jun. 30, 2024
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 June 30,202420232024202320242023
Service cost$2 $2 $1 $1 $4 $4 
Interest cost6 7 3 3 13 15 
Expected return on plan assets(5)(5)(6)(4)(19)(17)
Recognized net actuarial losses (gains)1 1 — (2)3 3 
Net periodic benefit costs (credits)4 5 (2)(2)1 5 
Settlement losses— 1 — — — 1 
Total, including other postretirement losses (gains)$4 $6 $(2)$(2)$1 $6 
U.S. Defined BenefitU.S. Retiree Health CareNon-U.S. Defined Benefit
For Six Months Ended June 30,202420232024202320242023
Service cost$4 $4 $1 $1 $8 $8 
Interest cost12 14 6 7 27 29 
Expected return on plan assets(11)(11)(9)(9)(38)(32)
Recognized net actuarial losses (gains)2 3 (1)(3)6 6 
Net periodic benefit costs (credits)7 10 (3)(4)3 11 
Settlement losses— 1 — — — 1 
Total, including other postretirement losses (gains)$7 $11 $(3)$(4)$3 $12