Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 4	$ 4
Interest Cost	138	157
Expected return on plan assets	(148)	(155)
Amortization of Prior Service (Benefit) Cost	(1)	(1)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	(7)	5
Other Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest Cost	8	10
Amortization of unrecognized loss (gain)	(4)	(5)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	$ 4	$ 5