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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Non-service cost components of net periodic pension and OPEB income $ 49 $ 86
Global OPEB Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 3 2
Interest cost 56 59
Expected return on plan assets 0 0
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial (gains) losses 0 (6)
Net periodic pension and OPEB (income) expense 59 55
U.S. | Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 47 44
Interest cost 533 568
Expected return on plan assets (685) (730)
Amortization of prior service cost (credit) 15 (1)
Amortization of net actuarial (gains) losses 2 0
Net periodic pension and OPEB (income) expense (88) (119)
Non-U.S. | Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 34 42
Interest cost 128 161
Expected return on plan assets (131) (168)
Amortization of prior service cost (credit) 1 1
Amortization of net actuarial (gains) losses 12 8
Net periodic pension and OPEB (income) expense $ 44 $ 44