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Derivative Instruments (Details) (Interest Rate Cap, USD $)
3 Months Ended 9 Months Ended
Oct. 29, 2011
Oct. 29, 2011
Oct. 27, 2012
Senior secured term loan
Derivative Instruments      
Variable interest rate basis     three-month LIBOR
Notional value     $ 2,000,000,000
Fixed interest rate (as a percent)     7.00%
Fair value included in Other assets 2,000,000 2,000,000  
Loss due to change in fair value $ 1,000,000 $ 4,000,000