Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2	$ 4	$ 5
Interest cost	18	16	37	32
Expected return on plan assets	(35)	(38)	(71)	(76)
Amortization of actuarial losses	9	10	17	20
Net periodic benefit income	(6)	(10)	(13)	(19)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	3	4	6
Interest cost	4	4	8	7
Amortization of actuarial losses	2	4	6	10
Amortization of prior service credit	(2)	(13)	(5)	(27)
Net periodic benefit income	$ 5	$ (2)	$ 13	$ (4)