Commitments, Contingent Liabilities and Other - Additional Information (Detail) € in Millions, ¥ in Millions	1 Months Ended	12 Months Ended
Oct. 31, 2015 EUR (€)	Mar. 31, 2018 JPY (¥)
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments and other outstanding		¥ 367,991
Litigation case about optical disk drive business, fine from European Commission \| €	€ 31
Maximum potential amount of future payments under guarantees		2,642
Financial Services
Commitments and Contingencies Disclosure [Line Items]
Unused portion of lines of credit extended to customers		31,245
Pictures
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments and other outstanding		¥ 118,914
Purchase commitments and other outstanding, term		3 years
Music
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments and other outstanding		¥ 73,259
Purchase commitments and other outstanding, term		5 years
Game & Network Services
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments and other outstanding		¥ 26,227
Purchase commitments and other outstanding, term		2 years
Advertising and Promotional Rights
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments and other outstanding		¥ 6,379
Purchase commitments and other outstanding, term		2 years

Commitments and Contingencies Disclosure [Line Items]

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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- Definition

Term of the unrecognized unconditional purchase obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

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