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Post-Employment Benefits - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period $ 55 $ 61 $ 162 $ 182
Interest cost on projected benefit obligations 124 118 369 352
Expected return on plan assets (282) (263) (841) (788)
Net amortization of:        
Actuarial loss, net 2 6 6 18
Prior service cost (credit) 0 0 1 1
Net cost (credit) (101) (78) (303) (235)
Medical and Dental Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 11 9 32 29
Interest cost on projected benefit obligations 17 13 51 40
Expected return on plan assets (7) (6) (20) (18)
Net amortization of:        
Actuarial loss, net 0 0 0 (1)
Prior service cost (credit) (2) (3) (7) (10)
Net cost (credit) $ 19 $ 13 $ 56 $ 40