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Postretirement benefit plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Postretirement benefit plans Postretirement benefit plansExpenses 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 30,202120202021202020212020
Service cost$6 $5 $1 $— $9 $8 
Interest cost7 8 2 3 10 10 
Expected return on plan assets(9)(9)(3)(3)(21)(20)
Recognized net actuarial loss4 2 — — 2 4 
Net periodic benefit costs8 6 — — — 2 
Settlement losses4 3 — — — — 
Total, including other postretirement losses$12 $9 $— $— $— $2 
U.S. Defined BenefitU.S. Retiree Health CareNon-U.S. Defined Benefit
For Six Months Ended June 30,202120202021202020212020
Service cost$11 $9 $2 $1 $18 $16 
Interest cost15 17 5 6 19 19 
Expected return on plan assets(17)(18)(6)(6)(41)(38)
Recognized net actuarial loss8 4 — — 4 7 
Net periodic benefit costs17 12 1 1 — 4 
Settlement losses8 7 — — 1 1 
Total, including other postretirement losses$25 $19 $1 $1 $1 $5