Derivatives And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended								9 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2011 Settled On Maturity [Member]	Sep. 30, 2011 Settled Prior To Maturity [Member]	Dec. 31, 2011 Fair Value Hedges [Member]	Mar. 31, 2011 Fair Value Hedges [Member]	Dec. 31, 2010 Fair Value Hedges [Member]	Dec. 31, 2011 Interest Rate Swap Agreements [Member] years	Nov. 30, 2011 Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional amount of interest rate fair value hedge derivatives				$ 50	$ 195	$ 0	$ 245	$ 245	$ 99
Notional amount of interest rate cash flow hedge derivatives										99
Aggregate gain on the termination of interest rate swap agreements		13
Period for reduction of aggregate notional amount of the interest rate swaps									5
Notional amount of foreign currency cash flow hedge derivatives related to purchases of tobacco in Brazil	188		109
Notional amount of foreign currency derivatives not designated as hedges related to tobacco processing cost in Brazil and tobacco purchases in other origins	55		58
Notional amount of foreign currency derivatives not designated as hedges related to net monetary assets and liabilities of foreign subsidiaries			60
Net unrealized gain on foreign currency derivatives designated as cash flow hedges	$ 0.5