Exit Costs And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Asset Impairments, Exit Costs And Other Charges [Line Items]
Exit related charges	$ 23
Settled with cash	23
Accrued balance	109	107
Closing Stores And Distribution Centers [Member]
Asset Impairments, Exit Costs And Other Charges [Line Items]
Exit related charges	25
Store And Warehouse Operating And Selling Expenses [Member]
Asset Impairments, Exit Costs And Other Charges [Line Items]
Exit related charges	15
General And Administrative Expenses [Member]
Asset Impairments, Exit Costs And Other Charges [Line Items]
Exit related charges	10
Additional Closure Costs And Accretion [Member]
Asset Impairments, Exit Costs And Other Charges [Line Items]
Exit related charges	2
Settled with cash	2
Accrued balance	$ 12	$ 12