Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension and other postretirement benefit contributions
Expected full year contributions to pension and other postretirement benefit plans during the year	$ 372
Pension and Other Postretirement Benefits
Pension and other postretirement benefit contributions
Contributions to pension and other postretirement benefit plans	208
Other Postretirement Benefits Plan
Components of net periodic benefit cost:
Service cost	17	$ 25
Interest cost	36	20
Expected return on plan assets	(3)	(4)
Amortization of prior service cost / (credit)	(3)	(1)
Net periodic benefit cost (benefit)	47	40
UNITED STATES
Components of net periodic benefit cost:
Service cost	0	0
Interest cost	164	100
Expected return on plan assets	(172)	(167)
Amortization of prior service cost / (credit)	0	0
Net periodic benefit cost (benefit)	(8)	(67)
Foreign Plan
Components of net periodic benefit cost:
Service cost	10	13
Interest cost	31	18
Expected return on plan assets	(40)	(34)
Amortization of prior service cost / (credit)	0	0
Net periodic benefit cost (benefit)	$ 1	$ (3)