Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension and other postretirement benefit contributions
Expected full year contributions to pension and other postretirement benefit plans during the year	$ 357		$ 357
Pension and Other Postretirement Benefits
Pension and other postretirement benefit contributions
Contributions to pension and other postretirement benefit plans	44		299
Other Postretirement Benefits Plan
Components of net periodic benefit cost:
Service cost	24	$ 25	74	$ 75
Interest cost	20	16	60	48
Expected return on plan assets	(3)	(1)	(9)	(4)
Amortization of prior service cost / (credit)	(1)	(11)	(4)	(31)
Net periodic benefit cost (benefit)	40	29	121	88
UNITED STATES
Components of net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	100	82	301	247
Expected return on plan assets	(167)	(180)	(502)	(538)
Amortization of prior service cost / (credit)	0	0	0	0
Net periodic benefit cost (benefit)	(67)	(98)	(201)	(291)
Foreign Plan
Components of net periodic benefit cost:
Service cost	15	15	40	44
Interest cost	17	16	53	43
Expected return on plan assets	(33)	(33)	(100)	(98)
Amortization of prior service cost / (credit)	0	0	0	0
Net periodic benefit cost (benefit)	$ (1)	$ (2)	$ (7)	$ (11)