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Summary of Notes Payable (Parenthetical) (Detail) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2012 8.50% senior notes due May 2019 | Dec. 31, 2011 8.50% senior notes due May 2019 | 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 6.90% senior notes due December 2039 USD ($) | Dec. 31, 2011 6.90% senior notes due December 2039 USD ($) | Mar. 31, 2012 3.45% senior notes due August 2015 | Dec. 31, 2011 3.45% senior notes due August 2015 | Mar. 31, 2012 2.65% senior notes due February 2017 USD ($) | Mar. 31, 2012 4.00% senior notes due February 2022 USD ($) | 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 1.47% yen-denominated Samurai notes due July 2014 JPY (¥) | Dec. 31, 2011 1.47% yen-denominated Samurai notes due July 2014 JPY (¥) | Mar. 31, 2012 1.87% yen-denominated Samurai notes due June 2012 JPY (¥) | Dec. 31, 2011 1.87% yen-denominated Samurai notes due June 2012 JPY (¥) | Mar. 31, 2012 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 (¥) | Mar. 31, 2012 3.60% yen-denominated loan due July 2015 JPY (¥) | Dec. 31, 2011 3.60% yen-denominated loan due July 2015 JPY (¥) | Mar. 31, 2012 3.00% yen-denominated loan due August 2015 JPY (¥) | Dec. 31, 2011 3.00% yen-denominated loan due August 2015 JPY (¥)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, interest rate | 8.50% | 8.50% | 6.45% | 6.45% | 6.90% | 6.90% | 3.45% | 3.45% | 2.65% | 4.00% | 2.26% | 2.26% | 1.47% | 1.47% | 1.87% | 1.87% | 1.84% | 1.84% | 1.35% | 1.34% |  | 3.60% | 3.60% | 3.00% | 3.00%
Notes payable, principal amount |  |  | $ 450 | $ 450 | $ 400 | $ 400 |  |  | $ 400 | $ 350 | ¥ 8,000 | ¥ 8,000 | ¥ 28,700 | ¥ 28,700 | ¥ 26,600 | ¥ 26,600 | ¥ 15,800 | ¥ 15,800 | ¥ 5,500 | ¥ 5,500 | ¥ 5,500 | ¥ 10,000 | ¥ 10,000 | ¥ 5,000 | ¥ 5,000
Notes payable, underwriting discount |  |  | $ 2 | $ 2 | $ 4 | $ 4 |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, maturity period (in years) |  |  |  |  |  |  |  |  | 5 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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