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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income     $ 149 $ 258
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 3 $ 3 8 7
Interest cost 56 59 170 177
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) 0 0 (1) (1)
Amortization of net actuarial (gains) losses 0 (6) 0 (17)
Net periodic pension and OPEB (income) expense 59 56 177 166
U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 47 44 141 131
Interest cost 533 568 1,599 1,704
Expected return on plan assets (686) (730) (2,056) (2,190)
Amortization of prior service cost (credit) 16 (1) 46 (2)
Amortization of net actuarial (gains) losses 2 0 6 0
Net periodic pension and OPEB (income) expense (88) (119) (264) (357)
Non-U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 40 39 110 123
Interest cost 112 184 373 521
Expected return on plan assets (116) (192) (384) (544)
Amortization of prior service cost (credit) 1 1 3 2
Amortization of net actuarial (gains) losses 12 8 35 25
Net periodic pension and OPEB (income) expense $ 49 $ 40 $ 137 $ 127