v3.26.1
Pension and Postretirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits | U.S.        
Components of Net Periodic Benefit Cost        
Service cost $ 33 $ 30 $ 67 $ 61
Interest cost 32 32 64 64
Expected return on plan assets (41) (38) (82) (76)
Amortization of net actuarial loss (gain) 3 4 6 8
Settlements 1 2 3 4
Net periodic benefit cost (credit) 28 30 58 61
Pension Benefits | Int’l.        
Components of Net Periodic Benefit Cost        
Service cost 2 3 4 6
Interest cost 8 10 17 18
Expected return on plan assets (11) (12) (23) (23)
Amortization of net actuarial loss (gain) (1) (1) (1) (1)
Settlements 0 0 0 0
Net periodic benefit cost (credit) (2) 0 (3) 0
Other Benefits        
Components of Net Periodic Benefit Cost        
Service cost 1 1 1 1
Interest cost 1 2 3 4
Expected return on plan assets 0 0 0 0
Amortization of net actuarial loss (gain) (1) (2) (2) (3)
Settlements 0 0 0 0
Net periodic benefit cost (credit) $ 1 $ 1 $ 2 $ 2