Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Nov. 04, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Litigation and non-litigation reserve					$ 53
Charge recorded in period		$ 49	$ 49
Reduction in revenue related to remediation measures		$ 3
Subsequent Event [Member]
Loss Contingencies [Line Items]
Consumer fund amount	$ 25
Litigation Settlement, Amount	$ 19