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Financial Instruments and Derivatives Financial Instruments, Other Than Investment in Direct Financing Leases, Investment in Subsidiaries and Affiliates, Pension Obligations and Insurance Contracts (Detail) (JPY ¥) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | ¥ 16,079 |  | ¥ 33,041 |  |  |
Assets | 9,069,392 |  | 8,439,710 |  | 8,332,830 |
Liabilities | 6,921,037 |  | 6,710,516 |  |  |
Cash and cash equivalents | 827,299 |  | 826,296 |  | 786,892 | 732,127
Restricted cash | 86,690 |  | 106,919 |  |  |
Time Deposits | 7,510 |  | 8,356 |  |  |
Short-term debt | 309,591 |  | 420,726 |  |  |
Deposits | 1,206,413 |  | 1,078,587 |  |  |
Long-Term Debt | 3,858,874 |  | 4,061,534 |  |  |
Trading Instruments | Level 1 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | 275 |  | 2,184 |  |  |
Trading Instruments | Level 1 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 8 |  | 147 |  |  |
Liabilities | 28 |  | 0 |  |  |
Trading Instruments | Level 1 | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Trading Instruments | Level 1 | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Trading Instruments | Level 2 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | 15,804 |  | 30,857 |  |  |
Trading Instruments | Level 2 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 156 |  | 0 |  |  |
Trading Instruments | Level 2 | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 29 |  | 370 |  |  |
Liabilities | 265 |  | 100 |  |  |
Trading Instruments | Level 2 | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 3,000 |  | 3,555 |  |  |
Liabilities | 3,605 |  | 3,530 |  |  |
Trading Instruments | Level 3 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | 0 |  | 0 |  |  |
Trading Instruments | Level 3 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Trading Instruments | Level 3 | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Trading Instruments | Level 3 | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 2,486 |  | 2,099 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 1 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 1 | Assets |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 827,299 |  | 826,296 |  |  |
Restricted cash | 86,690 |  | 106,919 |  |  |
Time Deposits | 0 |  | 0 |  |  |
Installment loans (net of allowance for probable loan losses) | 0 |  | 0 |  |  |
Non Trading Instruments | Level 1 | Investment in securities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Practicable to estimate fair value | 230,618 |  | 166,398 |  |  |
Not practicable to estimate fair value | 0 | [1] | 0 | [2] |  |
Non Trading Instruments | Level 1 | Liabilities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |
Deposits | 0 |  | 0 |  |  |
Long-Term Debt | 0 |  | 0 |  |  |
Non Trading Instruments | Level 1 | Foreign currency swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 1 | Interest rate swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 2 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 852 |  | 883 |  |  |
Liabilities | 4,782 |  | 4,685 |  |  |
Non Trading Instruments | Level 2 | Assets |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Restricted cash | 0 |  | 0 |  |  |
Time Deposits | 7,510 |  | 8,356 |  |  |
Installment loans (net of allowance for probable loan losses) | 120,583 |  | 82,125 |  |  |
Non Trading Instruments | Level 2 | Investment in securities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Practicable to estimate fair value | 671,023 |  | 552,394 |  |  |
Not practicable to estimate fair value | 0 | [1] | 0 | [2] |  |
Non Trading Instruments | Level 2 | Liabilities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 309,591 |  | 420,726 |  |  |
Deposits | 1,206,642 |  | 1,081,273 |  |  |
Long-Term Debt | 1,235,377 |  | 1,486,219 |  |  |
Non Trading Instruments | Level 2 | Foreign currency swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 3,534 |  | 2,890 |  |  |
Liabilities | 7,176 |  | 8,263 |  |  |
Non Trading Instruments | Level 2 | Interest rate swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 2,528 |  | 4,654 |  |  |
Liabilities | 634 |  | 1,459 |  |  |
Non Trading Instruments | Level 3 | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 3 | Assets |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Restricted cash | 0 |  | 0 |  |  |
Time Deposits | 0 |  | 0 |  |  |
Installment loans (net of allowance for probable loan losses) | 2,154,339 |  | 2,543,007 |  |  |
Non Trading Instruments | Level 3 | Investment in securities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Practicable to estimate fair value | 90,318 |  | 142,778 |  |  |
Not practicable to estimate fair value | 0 | [1] | 0 | [2] |  |
Non Trading Instruments | Level 3 | Liabilities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |
Deposits | 0 |  | 0 |  |  |
Long-Term Debt | 2,630,079 |  | 2,595,693 |  |  |
Non Trading Instruments | Level 3 | Foreign currency swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Non Trading Instruments | Level 3 | Interest rate swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |
Liabilities | 0 |  | 0 |  |  |
Carrying amount | Trading Instruments |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | 16,079 |  | 33,041 |  |  |
Carrying amount | Trading Instruments | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 8 |  | 147 |  |  |
Liabilities | 184 |  | 0 |  |  |
Carrying amount | Trading Instruments | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 29 |  | 370 |  |  |
Liabilities | 265 |  | 100 |  |  |
Carrying amount | Trading Instruments | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 5,486 |  | 5,654 |  |  |
Liabilities | 3,605 |  | 3,530 |  |  |
Carrying amount | Non Trading Instruments | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 852 |  | 883 |  |  |
Liabilities | 4,782 |  | 4,685 |  |  |
Carrying amount | Non Trading Instruments | Assets |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 827,299 |  | 826,296 |  |  |
Restricted cash | 86,690 |  | 106,919 |  |  |
Time Deposits | 7,510 |  | 8,356 |  |  |
Installment loans (net of allowance for probable loan losses) | 2,246,143 |  | 2,602,737 |  |  |
Carrying amount | Non Trading Instruments | Investment in securities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Practicable to estimate fair value | 984,654 |  | 852,550 |  |  |
Not practicable to estimate fair value | 213,843 | [1] | 208,077 | [2] |  |
Carrying amount | Non Trading Instruments | Liabilities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 309,591 |  | 420,726 |  |  |
Deposits | 1,206,413 |  | 1,078,587 |  |  |
Long-Term Debt | 3,858,874 |  | 4,061,534 |  |  |
Carrying amount | Non Trading Instruments | Foreign currency swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 3,534 |  | 2,890 |  |  |
Liabilities | 7,176 |  | 8,263 |  |  |
Carrying amount | Non Trading Instruments | Interest rate swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 2,528 |  | 4,654 |  |  |
Liabilities | 634 |  | 1,459 |  |  |
Estimated fair value | Trading Instruments |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Trading securities | 16,079 |  | 33,041 |  |  |
Estimated fair value | Trading Instruments | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 8 |  | 147 |  |  |
Liabilities | 184 |  | 0 |  |  |
Estimated fair value | Trading Instruments | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 29 |  | 370 |  |  |
Liabilities | 265 |  | 100 |  |  |
Estimated fair value | Trading Instruments | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 5,486 |  | 5,654 |  |  |
Liabilities | 3,605 |  | 3,530 |  |  |
Estimated fair value | Non Trading Instruments | Futures, Foreign exchange contracts |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 852 |  | 883 |  |  |
Liabilities | 4,782 |  | 4,685 |  |  |
Estimated fair value | Non Trading Instruments | Assets |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 827,299 |  | 826,296 |  |  |
Restricted cash | 86,690 |  | 106,919 |  |  |
Time Deposits | 7,510 |  | 8,356 |  |  |
Installment loans (net of allowance for probable loan losses) | 2,274,922 |  | 2,625,132 |  |  |
Estimated fair value | Non Trading Instruments | Investment in securities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Practicable to estimate fair value | 991,959 |  | 861,570 |  |  |
Not practicable to estimate fair value | 213,843 | [1] | 208,077 | [2] |  |
Estimated fair value | Non Trading Instruments | Liabilities |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 309,591 |  | 420,726 |  |  |
Deposits | 1,206,642 |  | 1,081,273 |  |  |
Long-Term Debt | 3,865,456 |  | 4,081,912 |  |  |
Estimated fair value | Non Trading Instruments | Foreign currency swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 3,534 |  | 2,890 |  |  |
Liabilities | 7,176 |  | 8,263 |  |  |
Estimated fair value | Non Trading Instruments | Interest rate swap agreements |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Assets | 2,528 |  | 4,654 |  |  |
Liabilities | ¥ 634 |  | ¥ 1,459 |  |  |
[1] | The fair value of investment securities of ¥213,843 million was not estimated, as it was not practical.
[2] | The fair value of investment securities of ¥208,077 million was not estimated, as it was not practical.

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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