Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 5	$ 5
Interest Cost	163	174
Expected return on plan assets	(133)	(152)
Amortization of Prior Service Benefit	(1)	(1)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	34	26
Other Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest Cost	10	12
Amortization of unrecognized loss (gain)	(3)	(2)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	$ 7	$ 10