v3.26.1
Post-Employment Benefits - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period $ 52 $ 53 $ 104 $ 107
Interest cost on projected benefit obligations 123 123 248 245
Expected return on plan assets (296) (281) (592) (559)
Net amortization of:        
Actuarial loss, net 2 2 3 4
Prior service cost (credit) 1 1 1 1
Net cost (credit) (118) (102) (236) (202)
Medical and Dental Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 11 11 23 21
Interest cost on projected benefit obligations 18 18 36 34
Expected return on plan assets (8) (6) (17) (13)
Net amortization of:        
Actuarial loss, net 1 0 3 0
Prior service cost (credit) 0 (3) 0 (5)
Net cost (credit) $ 22 $ 20 $ 45 $ 37