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Derivatives not Designated as Hedging Instruments (Detail) (Not Designated as Hedging Instrument, Foreign Exchange Contract, Other Nonoperating Income Expense, JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Other Nonoperating Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income on derivative	¥ 11,168	¥ 50,794	¥ (8,638)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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