Restructuring And Other Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring And Other Charges [Abstract]
Restructuring Reserve		$ 15	$ 18	$ 25
Severance Costs		38	12	68
Defined Benefit Plan, Special termination Benefits cost		44		5
Other restructuring costs		40		9
Restructuring Charges		168	35	$ 82
Transformation costs		46	23
Payment of restructuring costs	$ 30
Restructuring expenses		$ 168	$ 35