v3.26.3
Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income       $ 186
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 2 $ 2 $ 6 7
Interest cost 49 55 149 164
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) (3) (4) (11)
Net periodic pension and OPEB (income) expense 50 54 151 160
U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 38 42 116 125
Interest cost 431 499 1,293 1,496
Expected return on plan assets (570) (648) (1,710) (1,944)
Amortization of prior service cost (credit) 16 16 48 48
Amortization of net actuarial (gains) losses 3 2 8 7
Net periodic pension and OPEB (income) expense (82) (89) (245) (268)
Non-U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 49 27 121 137
Interest cost 115 123 346 358
Expected return on plan assets (123) (136) (376) (401)
Amortization of prior service cost (credit) 2 2 6 6
Amortization of net actuarial (gains) losses 14 10 43 30
Net periodic pension and OPEB (income) expense $ 57 $ 26 $ 140 $ 130