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Condensed Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Millions, except Per Share data
6 Months Ended
Jul. 30, 2011
Condensed Consolidated Statement Of Changes In Shareholders' Equity  
Unrealized gain (loss) on investments, tax $ 11
Unrealized gain (loss) on interest rate derivative, tax $ 9
Dividends paid, per share $ 0.5