Asset Impairment, Exit And Implementation Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012 2011 Cost Reduction Program [Member]	Mar. 31, 2013 Employee Severance [Member]	Dec. 31, 2012 Employee Severance [Member]	Mar. 31, 2012 Other Costs [Member] 2011 Cost Reduction Program [Member]	Mar. 31, 2012 Net Gain [Member] Recorded in Marketing Administrative and research Costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-Tax Implementation (Gain) Costs	$ 1	$ (17)			$ 8	$ (25)
Asset Impairment And Restructuring Exit Costs	0
Curtailment (gain) included in marketing, administration and research costs		(26)
Restructuring Reserve			$ 20	$ 37