Retirement and Severance Benefits (Reconciliation of Balances of Level Three Assets) (Details) (Level 3 [Member], JPY ¥) In Millions	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Beginning balance	¥ 15,112	¥ 6,265
Effect of changes in consolidated subsidiaries		5,822
Realized gains (losses)	2,167	831
Unrealized gains (losses) relating to assets held	2,706	2,416
Purchases, sales, issuances and settlements, net	2,575	56
Transfers out of Level 3	(1,546)	(278)
Ending balance	21,014	15,112
Collateralized Loan Obligation [Member]
Beginning balance	8,715	630
Effect of changes in consolidated subsidiaries		5,822
Realized gains (losses)	2,167	804
Unrealized gains (losses) relating to assets held	3,036	2,393
Purchases, sales, issuances and settlements, net	912	(656)
Transfers out of Level 3	(1,546)	(278)
Ending balance	13,284	8,715
Private Equity [Member]
Beginning balance	6,397	5,635
Realized gains (losses)		27
Unrealized gains (losses) relating to assets held	(330)	23
Purchases, sales, issuances and settlements, net	1,663	712
Ending balance	¥ 7,730	¥ 6,397

Fair value measurement with unobservable inputs reconciliation recurring basis asset value effect of changes in consolidated subsidiaries

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Namespace Prefix:	pc
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(2)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(3)

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant