Fair Value Measurements (Details 2) (JPY ¥) In Millions	Mar. 31, 2011	Mar. 31, 2010
Carrying amount [Member]
Estimated fair value of Sony's financial instruments
Long-term debt including the current portion	¥ 921,849	¥ 1,160,029
Investment contracts included in policyholders' account	322,649	306,625
Housing loans in the banking business, Carrying amount	656,047	555,105
Estimated fair value [Member]
Estimated fair value of Sony's financial instruments
Long-term debt including the current portion	928,820	1,168,354
Investment contracts included in policyholders' account	320,036	307,656
Housing loans in the banking business, Estimated fair value	¥ 714,985	¥ 612,830

Financial instruments financial assets and liabilities fair value balance sheet groupings.

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Housing Loans In Banking Business Estimated Fair Value.

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- Definition

Housing Loans In Banking Business Gross Carrying Value.

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- Definition

This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 97
-Paragraph 15

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 14
-Article 7

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