Derivative Instruments (Tables)	12 Months Ended
Dec. 31, 2011
Derivative Instruments [Abstract]
Effects of changes in the fair values of derivatives designated as cash flow hedges on the accompanying Consolidated Statements of Comprehensive Income	Effects of changes in the fair values of derivatives designated as cash flow hedges on the accompanying Consolidated Statements of Comprehensive Income

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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