Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 4	$ 5	$ 9	$ 10
Interest Cost	163	173	326	347
Expected return on plan assets	(133)	(151)	(266)	(303)
Amortization of Prior Service Benefit	(1)	(1)	(2)	(2)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	33	26	67	52
Other Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest Cost	10	12	20	24
Amortization of unrecognized loss (gain)	(3)	(3)	(6)	(5)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	$ 7	$ 9	$ 14	$ 19