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NOTES PAYABLE - Additional Information (Detail) | Feb. 29, 2012 series | Mar. 31, 2012 1.47% yen-denominated Samurai notes due July 2014 JPY (¥) | Dec. 31, 2011 1.47% yen-denominated Samurai notes due July 2014 JPY (¥) | Mar. 31, 2012 1.84% yen-denominated Samurai notes due July 2016 JPY (¥) | Dec. 31, 2011 1.84% yen-denominated Samurai notes due July 2016 JPY (¥) | Mar. 31, 2012 Variable interest rate yen-denominated Samurai notes due July 2014 JPY (¥) | Dec. 31, 2011 Variable interest rate yen-denominated Samurai notes due July 2014 JPY (¥) | Jul. 31, 2011 Variable interest rate yen-denominated Samurai notes due July 2014 JPY (¥) | Feb. 29, 2012 Senior Notes USD ($) | Mar. 31, 2012 2.65% senior notes due February 2017 USD ($) | Mar. 31, 2012 2.65% senior notes due February 2017 JPY (¥) | Mar. 31, 2012 4.00% senior notes due February 2022 USD ($) | Mar. 31, 2012 4.00% senior notes due February 2022 JPY (¥) | Mar. 31, 2012 6.45% senior notes due August 2040 USD ($) | Dec. 31, 2011 6.45% senior notes due August 2040 USD ($) | Mar. 31, 2012 3.45% senior notes due August 2015 | Dec. 31, 2011 3.45% senior notes due August 2015 | Mar. 31, 2012 6.90% senior notes due December 2039 USD ($) | Dec. 31, 2011 6.90% senior notes due December 2039 USD ($) | Mar. 31, 2012 8.50% senior notes due May 2019 | Dec. 31, 2011 8.50% senior notes due May 2019 | Mar. 31, 2012 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥) | Dec. 31, 2011 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥) | Mar. 31, 2012 1.87% yen-denominated Samurai notes due June 2012 JPY (¥) | Dec. 31, 2011 1.87% yen-denominated Samurai notes due June 2012 JPY (¥) | Mar. 31, 2012 Notes Payable USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of series of senior notes issued through a U.S. public debt offering (in series) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, principal amount |  | ¥ 28,700,000,000 | ¥ 28,700,000,000 | ¥ 15,800,000,000 | ¥ 15,800,000,000 | ¥ 5,500,000,000 | ¥ 5,500,000,000 | ¥ 5,500,000,000 | $ 750,000,000 | $ 400,000,000 |  | $ 350,000,000 |  | $ 450,000,000 | $ 450,000,000 |  |  | $ 400,000,000 | $ 400,000,000 |  |  | ¥ 8,000,000,000 | ¥ 8,000,000,000 | ¥ 26,600,000,000 | ¥ 26,600,000,000 |
Notes payable, effective principal amount |  |  |  |  |  |  |  |  |  |  | 30,900,000,000 |  | 27,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, interest rate |  | 1.47% | 1.47% | 1.84% | 1.84% | 1.35% | 1.34% |  |  | 2.65% | 2.65% | 4.00% | 4.00% | 6.45% | 6.45% | 3.45% | 3.45% | 6.90% | 6.90% | 8.50% | 8.50% | 2.26% | 2.26% | 1.87% | 1.87% |
Notes payable, effective interest rate |  |  |  |  |  |  |  | 1.475% |  | 1.22% | 1.22% | 2.07% | 2.07% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, debt default, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0

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