v3.26.1
Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Global OPEB Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost $ 2 $ 2
Interest cost 50 55
Expected return on plan assets 0 0
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial (gains) losses (2) (4)
Net periodic pension and OPEB (income) expense 50 53
U.S. | Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 39 41
Interest cost 431 499
Expected return on plan assets (571) (648)
Amortization of prior service cost (credit) 16 16
Amortization of net actuarial (gains) losses 3 2
Net periodic pension and OPEB (income) expense (82) (90)
Non-U.S. | Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 36 30
Interest cost 116 20
Expected return on plan assets (125) (25)
Amortization of prior service cost (credit) 2 2
Amortization of net actuarial (gains) losses 14 10
Net periodic pension and OPEB (income) expense $ 43 $ 37