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Retirement Benefits - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Contribution Plan Disclosure [Line Items]        
Service cost $ 26 $ 26 $ 80 $ 79
Interest cost 113 118 340 352
Expected return on assets (134) (138) (403) (415)
Prior service (credit) cost (1) (2) (4) (5)
Actuarial (gain) loss 22 9 69 25
Settlement charges 3 0 7 0
Non-service components of pension benefits & OPEB (credit) cost 3 (13) 9 (43)
Net periodic benefit cost 29 13 89 36
Pension Benefits        
Defined Contribution Plan Disclosure [Line Items]        
Service cost 22 22 67 67
Interest cost 95 99 286 296
Expected return on assets (123) (127) (371) (381)
Prior service (credit) cost 1 0 1 0
Actuarial (gain) loss 25 12 76 35
Settlement charges 3 0 7 0
Non-service components of pension benefits & OPEB (credit) cost 1 (16) (1) (50)
Net periodic benefit cost 23 6 66 17
OPEB        
Defined Contribution Plan Disclosure [Line Items]        
Service cost 4 4 13 12
Interest cost 18 19 54 56
Expected return on assets (11) (11) (32) (34)
Prior service (credit) cost (2) (2) (5) (5)
Actuarial (gain) loss (3) (3) (7) (10)
Settlement charges 0 0 0 0
Non-service components of pension benefits & OPEB (credit) cost 2 3 10 7
Net periodic benefit cost 6 7 23 19
Pension Plan and Other Postretirement Benefits Plan        
Defined Contribution Plan Disclosure [Line Items]        
Net periodic benefit cost $ 24 $ 24 $ 74 $ 71