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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail)
¥ / shares in Units, ¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jul. 21, 2015
JPY (¥)
TradingDay
¥ / shares
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2018
JPY (¥)
Mar. 31, 2017
JPY (¥)
Sep. 30, 2016
JPY (¥)
Debt Instrument [Line Items]              
Unsecured bank loans in connection with acquiring Ericsson's 50% equity interest in Sony Ericsson | $       $ 1,365      
Unsecured bank loans in connection with acquiring Ericsson's 50% equity interest in Sony Ericsson, repayment amount | $   $ 683 $ 682        
Long-term debt including current portion         ¥ 848,973 ¥ 734,886  
Securities Pledged as Collateral              
Debt Instrument [Line Items]              
Marketable securities and securities investments pledged as collateral, book value         38,375    
Pledged housing loans, book value         306,589    
Long-term secured loan         170,000    
Minimum              
Debt Instrument [Line Items]              
Unsecured bank loans in connection with acquiring Ericsson's 50% equity interest in Sony Ericsson, maturity terms       6 years      
Maximum              
Debt Instrument [Line Items]              
Unsecured bank loans in connection with acquiring Ericsson's 50% equity interest in Sony Ericsson, maturity terms       10 years      
Committed Lines of Credit              
Debt Instrument [Line Items]              
Line of credit facility, remaining borrowing capacity         ¥ 459,860    
Line of credit facility, period up to which company can borrow         180 days    
Commercial Paper Programs              
Debt Instrument [Line Items]              
Line of credit facility, remaining borrowing capacity         ¥ 818,720    
Line of credit facility, period up to which company can borrow         270 days    
Repurchase agreement, weighted average interest rate of 0.01%              
Debt Instrument [Line Items]              
Securities investments pledged as collateral, book value         ¥ 267,538    
Secured Call Money Weighted Average Interest Rate 0.08% | Securities Pledged as Collateral              
Debt Instrument [Line Items]              
Marketable securities and securities investments pledged as collateral, book value         119,213    
Cash settlements, variation margins of futures markets and certain other purposes              
Debt Instrument [Line Items]              
Marketable securities and securities investments pledged as collateral, book value         9,618    
Unsecured zero coupon convertible bonds, due 2022              
Debt Instrument [Line Items]              
Long-term debt including current portion ¥ 120,000       ¥ 119,976 ¥ 120,000  
Debt instrument interest rate 130.00%            
Stock acquisition rights, start date Sep. 01, 2015            
Conversion price per common share | ¥ / shares ¥ 5,008.0            
Amount in excess of dividends for which conversion price is adjusted | ¥ / shares ¥ 25            
Debt instrument outstanding percentage 100.00%            
Debt instrument redeemable date Jul. 21, 2020            
Debt instrument conversion price percentage on consecutive trading days 130.00%            
Debt instrument, convertible, consecutive trading days | TradingDay 20            
Basis for conversion bonds outstanding         If the closing sales price per share of Sony's common stock on the Tokyo Stock Exchange is 130% or more of the conversion price of the Zero Coupon Convertible Bonds for 20 consecutive trading days.    
Unsecured zero coupon convertible bonds, due 2022 | Minimum              
Debt Instrument [Line Items]              
Stock acquisition rights, end date Sep. 28, 2022            
Conversion price per common share | ¥ / shares ¥ 3,526.5            
Unsecured Debt              
Debt Instrument [Line Items]              
Aggregate principal amount newly issued for repayment of borrowings and debt             ¥ 200,000