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- Summary of Notes Payable (Parenthetical) (Detail) (JPY ¥) In Billions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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8.50% senior notes due May 2019 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 8.50% | 8.50%
6.45% senior notes due August 2040 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 6.45% | 6.45%
6.90% senior notes due December 2039 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 6.90% | 6.90%
3.45% senior notes due August 2015 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 3.45% | 3.45%
2.65% senior notes due February 2017 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 2.65% | 2.65%
4.00% senior notes due February 2022 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 4.00% | 4.00%
5.50% subordinated notes due September 2052 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 5.50% | 5.50%
2.26% yen-denominated Uridashi notes due September 2016 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 2.26% | 2.26%
Notes payable, principal amount | 8.0 | 8.0
1.47% yen-denominated Samurai notes due July 2014 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 1.47% | 1.47%
Notes payable, principal amount | 28.7 | 28.7
1.84% yen-denominated Samurai notes due July 2016 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 1.84% | 1.84%
Notes payable, principal amount | 15.8 | 15.8
Variable interest rate yen-denominated Samurai notes due July 2014 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 1.32% | 1.34%
Notes payable, principal amount | 5.5 | 5.5
3.60% yen-denominated loan due July 2015 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 3.60% | 3.60%
Notes payable, principal amount | 10.0 | 10.0
3.00% yen-denominated loan due August 2015 |  |
Debt Instrument [Line Items] |  |
Notes payable, interest rate | 3.00% | 3.00%
Notes payable, principal amount | 5.0 | 5.0

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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