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Retirement Benefits - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Contribution Plan Disclosure [Line Items]    
Service cost $ 25 $ 26
Interest cost 121 113
Expected return on assets (130) (135)
Prior service (credit) cost (2) (2)
Actuarial (gain) loss 24 23
Settlement charges 0 3
Non-service components of pension benefits & OPEB (credit) cost 13 2
Net periodic benefit cost 38 28
Pension Benefits    
Defined Contribution Plan Disclosure [Line Items]    
Service cost 21 22
Interest cost 102 95
Expected return on assets (122) (124)
Prior service (credit) cost 0 0
Actuarial (gain) loss 26 25
Settlement charges 0 3
Non-service components of pension benefits & OPEB (credit) cost 6 (1)
Net periodic benefit cost 27 21
OPEB    
Defined Contribution Plan Disclosure [Line Items]    
Service cost 4 4
Interest cost 19 18
Expected return on assets (8) (11)
Prior service (credit) cost (2) (2)
Actuarial (gain) loss (2) (2)
Settlement charges 0 0
Non-service components of pension benefits & OPEB (credit) cost 7 3
Net periodic benefit cost 11 7
Pension Plan and Other Postretirement Benefits Plan    
Defined Contribution Plan Disclosure [Line Items]    
Non-service components of pension benefits & OPEB (credit) cost 12 2
Net periodic benefit cost $ 23 $ 24