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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Global OPEB Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost $ 2 $ 3
Interest cost 55 56
Expected return on plan assets 0 0
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial (gains) losses (4) 0
Net periodic pension and OPEB (income) expense 53 59
U.S. | Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 41 47
Interest cost 499 533
Expected return on plan assets (648) (685)
Amortization of prior service cost (credit) 16 15
Amortization of net actuarial (gains) losses 2 2
Net periodic pension and OPEB (income) expense (90) (88)
Non-U.S. | Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 30 34
Interest cost 20 128
Expected return on plan assets (25) (131)
Amortization of prior service cost (credit) 2 1
Amortization of net actuarial (gains) losses 10 12
Net periodic pension and OPEB (income) expense $ 37 $ 44