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Condensed Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $)
In Millions, except Per Share data
3 Months Ended
Apr. 30, 2011
Condensed Consolidated Statement of Changes in Shareholders' Equity  
Unrealized gains (loss) on investments, tax $ 6
Unrealized gains (loss) on interest rate derivative, tax $ 2
Dividends paid, per share $ 0.25