Post-Employment Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined benefit plans
Defined benefit and other post-employment plans
Service cost	$ 116	$ 112
Interest cost	74	58
Expected return on plan assets	(180)	(166)
Amortization of prior service cost (credit)	1	1
Amortization of actuarial loss	57	70
Net periodic benefit cost	68	75
Other post-employment plans
Defined benefit and other post-employment plans
Service cost	12	12
Interest cost	6	5
Expected return on plan assets	0	0
Amortization of prior service cost (credit)	(10)	(10)
Amortization of actuarial loss	7	8
Net periodic benefit cost	$ 15	$ 15