Asset Impairment, Exit And Implementation Costs (Movement In The Severance Liability And Details Of Asset Impairment And Exit Costs) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Severance liability balance, December 31, 2011	$ 156
Charges	37
Cash spent	(71)
Other	(25)
Severance liability balance, June 30, 2012	97
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance liability balance, December 31, 2011	156
Charges	0
Cash spent	(59)
Other	0
Severance liability balance, June 30, 2012	97
Other [Member]
Restructuring Cost and Reserve [Line Items]
Charges	37
Cash spent	(12)
Other	$ (25)