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Post-Employment Benefits - Schedule of Net Periodic Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | $ 61 | $ 60
Interest cost on projected benefit obligations | 118 | 114
Expected return on plan assets | (262) | (242)
Net amortization of: |  |
Actuarial loss, net | 6 | 3
Prior service cost (credit) | 0 | 0
Net cost (credit) | (77) | (65)
Medical and Dental Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 10 | 9
Interest cost on projected benefit obligations | 15 | 14
Expected return on plan assets | (6) | (6)
Net amortization of: |  |
Actuarial loss, net | 0 | 0
Prior service cost (credit) | (3) | (3)
Net cost (credit) | $ 16 | $ 14

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