Restructuring And Transaction Costs (Schedule Of The Activity And Balances Associated With Restructuring Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 76	$ 20
Ending balance	225	18
Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	13	13
Ending balance	164	12
Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	63	7
Ending balance	61	6
Reduction Of Workforce [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	149
Reduction Of Workforce [Member] | Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	$ 149
Reduction Of Workforce [Member] | Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity
Prior Years' Restructurings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity		(2)
Prior Years' Restructurings [Member] | Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	$ 2	(1)
Prior Years' Restructurings [Member] | Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	$ (2)	$ (1)