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Short-Term Borrowings (Narrative) (Detail)	12 Months Ended
Short-Term Borrowings (Narrative) (Detail)	Dec. 31, 2011
Short-term Debt [Line Items]
Short-term borrowings maturity terms (in days)	2
Short-term borrowings, fixed interest rate	0.14%

Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements.

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