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Post-Employment Benefits - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period $ 53 $ 60 $ 107 $ 121
Interest cost on projected benefit obligations 123 116 245 234
Expected return on plan assets (281) (263) (559) (525)
Net amortization of:        
Actuarial loss, net 2 6 4 12
Prior service cost (credit) 1 1 1 1
Net cost (credit) (102) (80) (202) (157)
Medical and Dental Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 11 10 21 20
Interest cost on projected benefit obligations 18 12 34 27
Expected return on plan assets (6) (6) (13) (12)
Net amortization of:        
Actuarial loss, net 0 (1) 0 (1)
Prior service cost (credit) (3) (4) (5) (7)
Net cost (credit) $ 20 $ 11 $ 37 $ 27