Retirement Programs - Components of Net Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Amount recognized in Operating Profit
Service cost	$ 21	$ 21	$ 63	$ 63
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost	91	94	273	280
Expected return on plan assets	(140)	(132)	(415)	(392)
Net amortization and deferral	(2)	(9)	(8)	(25)
Settlement charge	6	12	6	12
Net pension and OPEB cost (benefit)	(45)	(35)	(144)	(125)
Net periodic benefit cost (benefit)	(24)	(14)	$ (81)	$ (62)
Settlement charge, after tax	$ 5	$ 10