Segment Information - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue, Major Customer [Line Items]
Minimum sales as a percentage of net consolidated sales to conduct business in any individual country	10.00%	10.00%	10.00%
Net sales	¥ 3,557,433	¥ 3,706,901	¥ 3,209,201
UNITED STATES
Revenue, Major Customer [Line Items]
Net sales	¥ 779,652	¥ 836,645	¥ 793,428

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration