Benefit Plans (Termination, Settlement and Curtailment Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		$ 0	$ 6
Net loss		10	20
Prior service cost (credit)		0	1
Termination, settlement, and curtailment costs	$ 0	10	27
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation			10
Net loss			0
Prior service cost (credit)			(5)
Termination, settlement, and curtailment costs	$ 0	$ 0	$ 5