Restructuring (Schedule Of Restructuring Activity And Related Liabilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Cash payments	$ (32)
Non-cash charges	(1)
Balance December 31, 2011	67
Severance And Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Charges	54
Cash payments	(32)
Balance December 31, 2011	22
Other Exit- Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Charges	46
Non-cash charges	(1)
Balance December 31, 2011	45
Restructuring Charges Attributable To 2011 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charges	$ 100