Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other Postretirement Benefits
Service cost	$ 23	$ 18
Interest cost	65	63
Expected return on plan assets	(4)	(5)
Amortization of actuarial loss/(gain)	(24)	(26)
Amortization of prior service cost	(15)	(16)
Net benefit cost	45	34
U.S. | Pension Plan
Service cost	136	113
Interest cost	170	168
Expected return on plan assets	(149)	(181)
Amortization of actuarial loss/(gain)	18	21
Amortization of prior service cost	(7)	(8)
Net pension enhancement and curtailment/settlement cost	36	3
Net benefit cost	204	116
Pension Benefits - Non-U.S. | Pension Plan
Service cost	78	83
Interest cost	222	227
Expected return on plan assets	(221)	(261)
Amortization of actuarial loss/(gain)	9	25
Amortization of prior service cost	13	13
Net benefit cost	$ 101	$ 87