Retirement Programs - Components of Net Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Amount recognized in Operating Profit
Service cost	$ 20	$ 21
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost	86	91
Expected return on plan assets	(134)	(138)
Net amortization and deferral (gain) loss	(8)	(3)
Net pension and OPEB cost (benefit)	(56)	(50)
Net periodic benefit cost (benefit)	$ (36)	$ (29)