Benefit Obligations (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 266	$ 221
Liability, Defined Benefit Plan, Current	(22)	(22)
Liability, Defined Benefit Plan	(462)	(504)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(218)	(305)
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	(4)	(4)
Liability, Defined Benefit Plan	(47)	(47)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (51)	$ (51)