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Retirement Programs - Components of Net Pension and Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Amount recognized in Operating Profit    
Service cost $ 21 $ 21
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost    
Interest cost 91 92
Expected return on plan assets (138) (129)
Net amortization and deferral (3) (8)
Net pension and OPEB cost (benefit) (50) (45)
Net periodic benefit cost (benefit) $ (29) $ (24)