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Legal Reserve and Retained Earnings - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Stockholders Equity Note [Line Items]  
Percentage of legal reserve appropriated from distributions from retained earnings paid by Canon Inc. and its subsidiaries 10.00%
Appropriations not required if percentage of additional paid in capital and legal reserve equals specific percentage of respective stated capital 25.00%
Year end dividends approved by stockholders ¥ 72,092
Amount available for dividends under the Corporation Law of Japan 1,223,401
Retained earnings included Canon's equity in undistributed earinings of affiliated companies accounted for by the equity method ¥ 16,217