v3.26.1
Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 2 $ 3 $ 4 $ 5
Interest cost 50 54 100 109
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) 0 0 0 0
Amortization of net actuarial (gains) losses (1) (4) (3) (8)
Net periodic pension and OPEB (income) expense 51 53 101 106
U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 39 42 78 83
Interest cost 431 498 862 997
Expected return on plan assets (569) (648) (1,140) (1,296)
Amortization of prior service cost (credit) 16 16 32 32
Amortization of net actuarial (gains) losses 2 3 5 5
Net periodic pension and OPEB (income) expense (81) (89) (163) (179)
Non-U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 36 59 72 89
Interest cost 115 14 231 34
Expected return on plan assets (127) (17) (252) (42)
Amortization of prior service cost (credit) 2 2 4 4
Amortization of net actuarial (gains) losses 15 10 29 20
Net periodic pension and OPEB (income) expense $ 41 $ 68 $ 84 $ 105