Retirement Programs - Schedule of Pension and OPEB Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Amount recognized in Operating Profit
Service cost	$ 32	$ 39	$ 65	$ 79
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost
Interest cost	51	38	104	77
Expected return on plan assets	(132)	(131)	(268)	(262)
Net amortization and deferral	19	44	38	87
Net pension and OPEB cost (benefit)	(62)	(49)	(126)	(98)
Net periodic benefit cost (benefit)	$ (30)	$ (10)	$ (61)	$ (19)