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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 3	$ 5	$ 13	$ 14
Interest Cost	171	126	518	343
Expected return on plan assets	(151)	(180)	(454)	(560)
Amortization of unrecognized loss (gain)	0	0	0	2
Amortization of Prior Service Benefit	0	0	(2)	(2)
Settlement Loss (Gain)	1	25	1	27
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	24	(24)	76	(176)
Other Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1	0	1	1
Interest Cost	12	6	36	19
Amortization of unrecognized loss (gain)	(2)	1	(7)	2
Amortization of Prior Service Benefit	(1)	0	(1)	(1)
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost	$ 10	$ 7	$ 29	$ 21