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Business Segment Information - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Feb. 15, 2012
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Segment Reporting Disclosure [Line Items]        
Percentage of U.S. based joint-venture in Music segment   50.00%    
Equity in net income (loss) of affiliated companies   ¥ (121,697) ¥ 14,062 ¥ (30,235)
Sony Ericsson
       
Segment Reporting Disclosure [Line Items]        
Percentage of ownership in equity investees 50.00% 50.00%    
Remeasurement gain   102,331 [1]    
Sony Mobile Communications
       
Segment Reporting Disclosure [Line Items]        
Percentage of equity interest acquired 50.00%      
Remeasurement gain 102,331      
Equity in net income (loss) of affiliated companies   ¥ (57,680) ¥ 4,155 ¥ (34,514)
[1] Refer to Note 24.