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Contingencies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
Oct. 31, 2014
Nov. 14, 2007
Braun Hummel lawsuit
Oct. 13, 2006
Braun Hummel lawsuit
Dec. 01, 2014
Subsequent Event [Member]
Asda Equal Value Lawsuit [Domain]
Loss Contingencies [Line Items]        
Document Period End Date Oct. 31, 2014      
Loss contingency, loss in period     $ 78  
Litigation settlement, gross   $ 188    
Rate of post-judgment interest accrual   6.00%    
Loss Contingency, New Claims Filed, Number       1,551