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Divestitures - Additional Information (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Apr. 01, 2017
USD ($)
Mar. 31, 2018
JPY (¥)
Mar. 31, 2017
JPY (¥)
Battery Business Asset Group | Discontinued Operations, Held-for-sale | Other Operating Expense, Net      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment losses recorded as a result of fair value valuation of assets and liabilities | ¥     ¥ 42,298
Sony Electronics Huanan Co., Ltd [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration for sale of subsidiaries | $ $ 234    
Sales price of business | $ $ 95    
Gain (loss) on sale of investments | ¥   ¥ 28,262