Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details Textual)

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Goodwill and Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
May 31, 2012
Jul. 31, 2012
Goodwill, Impairment Loss $ 17 $ 17