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Inventories (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Schedule of Inventory [Line Items]    
Finished products ¥ 498,430 ¥ 529,666
Work in process 88,236 70,969
Raw materials, purchased components and supplies 120,386 103,408
Inventories ¥ 707,052 ¥ 704,043