Restructuring Costs And Other Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Costs And Other Charges [Abstract]
Restructuring reserve	$ 2		$ 2		$ 15
Restructuring costs	36	$ 31	84	$ 59
Transformation costs		16	8	29
Transformation initiatives			8
Severance expense	2	$ 15	4	$ 30
Consulting and advisory costs	$ 34		$ 72