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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income     $ 186 $ 149
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 2 $ 3 7 8
Interest cost 55 56 164 170
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) 0 0 0 (1)
Amortization of net actuarial (gains) losses (3) 0 (11) 0
Net periodic pension and OPEB (income) expense 54 59 160 177
U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 42 47 125 141
Interest cost 499 533 1,496 1,599
Expected return on plan assets (648) (686) (1,944) (2,056)
Amortization of prior service cost (credit) 16 16 48 46
Amortization of net actuarial (gains) losses 2 2 7 6
Net periodic pension and OPEB (income) expense (89) (88) (268) (264)
Non-U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 27 40 137 110
Interest cost 123 112 358 373
Expected return on plan assets (136) (116) (401) (384)
Amortization of prior service cost (credit) 2 1 6 3
Amortization of net actuarial (gains) losses 10 12 30 35
Net periodic pension and OPEB (income) expense $ 26 $ 49 $ 130 $ 137