Restructuring Costs And Other Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring Costs And Other Charges [Abstract]
Restructuring reserve	$ 3		$ 3		$ 15
Restructuring costs	$ 3	$ 27	87	$ 86
Transformation costs		9	8	38
Severance expense		$ 18	7	$ 48
Consulting and advisory costs			$ 72