Post-Employment Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined benefit plans
Defined benefit and other post-employment plans
Service cost	$ 67	$ 113	$ 135	$ 229
Interest cost	109	75	216	149
Expected return on plan assets	(182)	(179)	(362)	(359)
Amortization of prior service cost (credit)	1	0	1	1
Amortization of actuarial loss	4	59	8	116
Net periodic benefit cost (credit)	(1)	68	(2)	136
Other post-employment plans
Defined benefit and other post-employment plans
Service cost	10	13	18	25
Interest cost	10	6	19	12
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(9)	(9)	(18)	(19)
Amortization of actuarial loss	3	6	6	13
Net periodic benefit cost (credit)	$ 14	$ 16	$ 25	$ 31