Restructuring Costs And Other Charges (Restructuring Reserve Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			$ 15
Severance expense	$ 2	$ 15	4	$ 30
Transformation costs		$ 16	8	$ 29
Other costs	34		72
Cash payments during the period			(97)
Restructuring Reserve, Ending Balance	$ 2		$ 2