v3.25.4
Postemployment benefit plans - Components of net periodic benefit cost, amounts recognized in OCI, weighted average assumptions used to determine net periodic benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Components of net periodic benefit cost:      
Net periodic benefit cost (benefit) $ 185 $ 67 $ (65)
Pension Plan | U.S. Pension Benefits      
Components of net periodic benefit cost:      
Service cost 0 0 0
Interest cost 612 625 656
Expected return on plan assets (720) (699) (689)
Curtailments, settlements and termination benefits 0 0 0
Amortization of prior service cost (credit) 0 0 0
Actuarial loss (gain) (162) 0 (138)
Net periodic benefit cost (benefit) (270) (74) (171)
Amounts recognized in other comprehensive income (pre-tax):      
Current year prior service cost (credit) 0 0 0
Amortization of prior service (cost) credit 0 0 0
Total recognized in other comprehensive income 0 0 0
Total recognized in net periodic cost and other comprehensive income $ (270) $ (74) $ (171)
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate used to measure service cost 0.00% 0.00% 0.00%
Discount rate used to measure interest cost 5.30% 5.00% 5.20%
Expected rate of return on plan assets 6.30% 5.70% 5.80%
Rate of compensation increase 0.00% 0.00% 0.00%
Pension Plan | Non-U.S.  Pension Benefits      
Components of net periodic benefit cost:      
Service cost $ 49 $ 43 $ 40
Interest cost 118 118 124
Expected return on plan assets (171) (165) (163)
Curtailments, settlements and termination benefits 0 0 1
Amortization of prior service cost (credit) 1 0 0
Actuarial loss (gain) (26) 59 172
Net periodic benefit cost (benefit) (29) 55 174
Amounts recognized in other comprehensive income (pre-tax):      
Current year prior service cost (credit) 7 0 1
Amortization of prior service (cost) credit (1) 0 0
Total recognized in other comprehensive income 6 0 1
Total recognized in net periodic cost and other comprehensive income $ (23) $ 55 $ 175
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate used to measure service cost 3.20% 3.60% 3.80%
Discount rate used to measure interest cost 3.90% 3.90% 4.20%
Expected rate of return on plan assets 5.20% 5.10% 5.20%
Rate of compensation increase 2.20% 2.30% 2.30%
Other Postretirement  Benefits      
Components of net periodic benefit cost:      
Service cost $ 63 $ 67 $ 67
Interest cost 125 131 144
Expected return on plan assets (9) (7) (11)
Curtailments, settlements and termination benefits 0 0 0
Amortization of prior service cost (credit) (5) (14) (12)
Actuarial loss (gain) (106) (213) (131)
Net periodic benefit cost (benefit) 68 (36) 57
Amounts recognized in other comprehensive income (pre-tax):      
Current year prior service cost (credit) 0 0 (2)
Amortization of prior service (cost) credit 5 14 12
Total recognized in other comprehensive income 5 14 10
Total recognized in net periodic cost and other comprehensive income $ 73 $ (22) $ 67
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate used to measure service cost 5.70% 5.10% 5.40%
Discount rate used to measure interest cost 5.30% 5.00% 5.30%
Expected rate of return on plan assets 6.10% 7.40% 7.40%
Rate of compensation increase 4.00% 4.00% 4.00%