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Trade Receivables (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes ¥ 16,739 ¥ 15,441
Accounts 528,032 556,983
Trade Accounts And Notes Receivable Gross Current, Total 544,771 572,424
Less allowance for doubtful receivables (11,563) (14,920)
Trade receivables, net (Note 3) ¥ 533,208 ¥ 557,504