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Finance Receivables and Operating Leases - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Minimum
Leases Disclosure [Line Items]
Term of financing receivables	1 year
Maximum
Leases Disclosure [Line Items]
Term of financing receivables	8 years
Equipment Leased to Customers
Leases Disclosure [Line Items]
Property, plant and equipment lease	¥ 75,391	¥ 63,239
Accumulated depreciation on property, plant and equipment lease	¥ 54,791	¥ 43,829

The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.