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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost $ 2 $ 3 $ 9 $ 12
Interest Cost 158 162 471 488
Expected return on plan assets (156) (133) (466) (399)
Amortization of Prior Service (Benefit) Cost (1) 0 (3) (2)
Settlement Loss (Gain) 0 1 0 1
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost 3 33 11 100
Other Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest Cost 10 11 30 31
Amortization of unrecognized loss (gain) (4) (3) (13) (9)
Amortization of Prior Service (Benefit) Cost (1) (1) (1) (1)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost $ 5 $ 7 $ 16 $ 21