Retirement Programs - Components of Net Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Amount recognized in Operating Profit
Service cost	$ 21	$ 21	$ 42	$ 42
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost	91	94	182	186
Expected return on plan assets	(137)	(131)	(275)	(260)
Net amortization and deferral	(3)	(8)	(6)	(16)
Net pension and OPEB cost (benefit)	(49)	(45)	(99)	(90)
Net periodic benefit cost (benefit)	$ (28)	$ (24)	$ (57)	$ (48)