Retirement Programs - Pension and Postretirement Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost	$ (190)	$ (164)	$ (237)
Pensions
Defined Benefit Plan Disclosure [Line Items]
Service cost	84	84	127
Interest cost	362	373	201
Expected return on plan assets	(552)	(523)	(518)
Net amortization and deferral	(10)	(30)	74
Settlement charges	10	16	6
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost	(190)	(164)	(237)
Net periodic benefit cost (benefit)	$ (106)	$ (80)	$ (110)