v3.26.1
Retirement Benefits (Unaudited) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Components of Net Periodic Benefit Cost        
Net periodic benefit cost (benefit)     $ (240) $ (169)
Defined contribution plan, employer contributions $ 158 $ 155 387 384
Pension Benefits        
Components of Net Periodic Benefit Cost        
Service cost 53 54 106 108
Interest cost 399 402 798 805
Expected return on plan assets (565) (539) (1,130) (1,079)
Amortization of prior service credit 0 0 0 0
Other 0 0 0 7
Net periodic benefit cost (benefit) (113) (83) (226) (159)
Defined benefit plan, contributions by Employer 20 24 42 42
OPB        
Components of Net Periodic Benefit Cost        
Service cost 1 1 2 2
Interest cost 14 15 29 31
Expected return on plan assets (22) (21) (44) (42)
Amortization of prior service credit 0 0 (1) (1)
Other 0 0 0 0
Net periodic benefit cost (benefit) (7) (5) (14) (10)
Defined benefit plan, contributions by Employer $ 10 $ 10 $ 21 $ 20