XML 291 R92.htm IDEA: XBRL DOCUMENT v3.24.3
Retirement Benefits - Calculation of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Amortization of:        
Non-service net periodic benefit cost $ (13) $ (18) $ (29) $ (18)
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 43 39 125 116
Interest cost 141 145 423 434
Expected return on assets (184) (189) (552) (566)
Amortization of:        
Prior service cost (credit) 1 1 2 2
Actuarial loss 53 41 160 125
Settlement charges 0 18 0 18
Non-service net periodic benefit cost 54 55 158 129
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 6 20 18
Interest cost 24 25 72 76
Expected return on assets (21) (21) (63) (63)
Amortization of:        
Prior service cost (credit) (2) (2) (6) (7)
Actuarial loss 0 0 0 (1)
Settlement charges 0 0 0 0
Non-service net periodic benefit cost $ 7 $ 8 $ 23 $ 23