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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

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