Post-Employment Benefits - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$ 60	$ 58	$ 121	$ 118
Interest cost on projected benefit obligations	116	114	234	228
Expected return on plan assets	(263)	(243)	(525)	(485)
Curtailment gain	0	(14)	0	(14)
Net amortization of:
Actuarial loss, net	6	3	12	6
Prior service cost (credit)	1	0	1	0
Net cost (credit)	(80)	(82)	(157)	(147)
Medical and Dental Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	10	10	20	19
Interest cost on projected benefit obligations	12	16	27	30
Expected return on plan assets	(6)	(6)	(12)	(12)
Curtailment gain	0	0	0	0
Net amortization of:
Actuarial loss, net	(1)	(1)	(1)	(1)
Prior service cost (credit)	(4)	(4)	(7)	(7)
Net cost (credit)	$ 11	$ 15	$ 27	$ 29