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Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost $ 3 $ 3 $ 12 $ 13
Interest Cost 162 171 488 518
Expected return on plan assets (133) (151) (399) (454)
Amortization of Prior Service Benefit 0 0 (2) (2)
Settlement Loss (Gain) 1 1 1 1
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost 33 24 100 76
Other Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost 0 1 0 1
Interest Cost 11 12 31 36
Amortization of unrecognized loss (gain) (3) (2) (9) (7)
Amortization of Prior Service Benefit (1) (1) (1) (1)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost $ 7 $ 10 $ 21 $ 29