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v3.26.1

Postretirement benefit plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 2 | $ 2
Interest cost | 6 | 6
Expected return on plan assets | (6) | (4)
Recognized net actuarial losses (gains) | 1 | 2
Amortization of prior service cost (credit) | 0 | 0
Net periodic benefit costs (credits) | 3 | 6
U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0 | 0
Interest cost | 3 | 3
Expected return on plan assets | (3) | (3)
Recognized net actuarial losses (gains) | 0 | 0
Amortization of prior service cost (credit) | 0 | 0
Net periodic benefit costs (credits) | 0 | 0
Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 4 | 4
Interest cost | 16 | 14
Expected return on plan assets | (19) | (18)
Recognized net actuarial losses (gains) | (1) | 1
Amortization of prior service cost (credit) | 1 | 0
Net periodic benefit costs (credits) | $ 1 | $ 1

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit. + References No definition available. + Details
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