Restructuring and Other Charges (Rollforward Of Severance And Other Costs Tables) (Details) (Employee Severance And Other Cost [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Two Thousand And Fourteen Organizational Restructuring Charges [Member]
Restructuring Reserve by Type of Cost [Line Items]
Additions and adjustments	$ 41
Cash payments	(29)
Ending balance	12
Two Thousand And Thirteen Organizational Restructuring Charges [Member]
Restructuring Reserve by Type of Cost [Line Items]
Additions and adjustments		46
Cash payments	(41)	(5)
Ending balance	0
Two Thousand And Twelve Organizational Restructuring Charges [Member]
Restructuring Reserve by Type of Cost [Line Items]
Additions and adjustments			17
Cash payments	(6)	(4)	(3)
Ending balance	$ 4