Variable Interest Entities - Additional Information (Detail) - Joint ventures with companies involved in production and creation of recorded music ¥ in Millions	Mar. 31, 2019 JPY (¥)
Variable Interest Entity [Line Items]
Variable interest entity primary beneficiary, aggregate total assets	¥ 47,700
Variable interest entity primary beneficiary, aggregate total liabilities	¥ 27,861

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=sne_VariableInterestEntityTwoMember
Namespace Prefix:
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Period Type: