Retirement Programs - Schedule of Pension and OPEB Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Amount recognized in Operating Profit
Service cost	$ 21	$ 31	$ 63	$ 96
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost	94	49	280	153
Expected return on plan assets	(132)	(126)	(392)	(394)
Net amortization and deferral	(9)	18	(25)	56
Settlement Charge	12	6	12	6
Net pension and OPEB cost (benefit)	(35)	(53)	(125)	(179)
Net periodic benefit cost (benefit)	(14)	(22)	$ (62)	$ (83)
Settlement charge, after tax	$ 10	$ 5