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Business Segment Information - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2012
Sony Ericsson
Feb. 15, 2012
Sony Ericsson
Feb. 15, 2012
Sony Mobile Communications
Segment Reporting Disclosure [Line Items]            
Percentage of equity interest acquired           50.00%
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) ¥ (57,680)    
Remeasurement gain       ¥ 102,331 [1]    
Percentage of ownership in equity investees       50.00% 50.00%  
[1] Refer to Note 24.