Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 4	$ 7
Interest Cost	108	91
Expected return on plan assets	(190)	(230)
Amortization of unrecognized loss (gain)	1	14
Amortization of Prior Service Benefit	(1)	0
Settlement/Curtailment Loss (Gain)	0	1
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	(78)	(117)
Other Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest Cost	7	6
Amortization of unrecognized loss (gain)	0	23
Amortization of Prior Service Benefit	0	(230)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	$ 7	$ (201)