Transfer of Financial Assets - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Transfers and Servicing [Abstract]
Trade accounts receivable sold	¥ 65,214	¥ 81,947	¥ 84,718

Amount of total receivables sold to a commercial bank or a special purpose entity associated with a sponsor bank and accounted for as sales in accordance with the accounting guidance for transfers of financial assets during the fiscal year.

No definition available.

Name:	sne_TradeAccountsReceivableSold
Namespace Prefix:	sne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration