Benefit Obligations (Schedule of Net Periodic Benefit Costs Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 3	$ 7	$ 7
Interest cost	16	14	33	27
Expected return on plan assets	(42)	(52)	(83)	(103)
Total	(22)	(35)	(43)	(69)
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	1
Interest cost	1	0	1	0
Expected return on plan assets	0	0	0	0
Total	$ 1	$ 1	$ 1	$ 1