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Summary of Notes Payable (Parenthetical) (Detail)
In Millions, unless otherwise specified
Dec. 31, 2011
6.45% senior notes due August 2040
USD ($)
Dec. 31, 2010
6.45% senior notes due August 2040
USD ($)
Aug. 31, 2010
6.45% senior notes due August 2040
USD ($)
Dec. 31, 2011
8.50% senior notes due May 2019
Dec. 31, 2010
8.50% senior notes due May 2019
May 31, 2009
8.50% senior notes due May 2019
USD ($)
Dec. 31, 2011
6.90% senior notes due December 2039
USD ($)
Dec. 31, 2010
6.90% senior notes due December 2039
USD ($)
Dec. 31, 2009
6.90% senior notes due December 2039
USD ($)
Dec. 31, 2011
3.45% senior notes due August 2015
Dec. 31, 2010
3.45% senior notes due August 2015
Aug. 31, 2010
3.45% senior notes due August 2015
USD ($)
Dec. 31, 2010
1.52% yen-denominated Uridashi notes paid September 2011
JPY (¥)
Sep. 30, 2006
1.52% yen-denominated Uridashi notes paid September 2011
JPY (¥)
Dec. 31, 2011
2.26% yen-denominated Uridashi notes due September 2016
JPY (¥)
Dec. 31, 2010
2.26% yen-denominated Uridashi notes due September 2016
JPY (¥)
Sep. 30, 2006
2.26% yen-denominated Uridashi notes due September 2016
JPY (¥)
Dec. 31, 2010
Variable interest rate yen-denominated Uridashi notes paid September 2011
JPY (¥)
Sep. 30, 2006
Variable interest rate yen-denominated Uridashi notes paid September 2011
JPY (¥)
Dec. 31, 2011
1.47% yen-denominated Samurai notes due July 2014
JPY (¥)
Jul. 31, 2011
1.47% yen-denominated Samurai notes due July 2014
JPY (¥)
Dec. 31, 2011
1.87% yen-denominated Samurai notes due June 2012
JPY (¥)
Dec. 31, 2010
1.87% yen-denominated Samurai notes due June 2012
JPY (¥)
Jun. 30, 2007
1.87% yen-denominated Samurai notes due June 2012
JPY (¥)
Dec. 31, 2011
1.84% yen-denominated Samurai notes due July 2016
JPY (¥)
Jul. 31, 2011
1.84% yen-denominated Samurai notes due July 2016
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 (¥)
Dec. 31, 2011
3.60% yen-denominated loan due July 2015
JPY (¥)
Dec. 31, 2010
3.60% yen-denominated loan due July 2015
JPY (¥)
Dec. 31, 2011
3.00% yen-denominated loan due August 2015
JPY (¥)
Dec. 31, 2010
3.00% yen-denominated loan due August 2015
JPY (¥)
Debt Instrument [Line Items]                                                                
Notes payable, interest rate 6.45% 6.45%   8.50% 8.50%   6.90% 6.90%   3.45% 3.45%   1.52%   2.26% 2.26%   0.66%   1.47% 1.47% 1.87% 1.87%   1.84% 1.84% 1.34%   3.60% 3.60% 3.00% 3.00%
Notes payable, principal amount $ 450 $ 450 $ 450     $ 850 $ 400 $ 400 $ 400     $ 300 ¥ 15,000 ¥ 15,000 ¥ 8,000 ¥ 8,000 ¥ 10,000 ¥ 20,000 ¥ 20,000 ¥ 28,700 ¥ 28,700 ¥ 26,600 ¥ 26,600 ¥ 30,000 ¥ 15,800 ¥ 15,800 ¥ 5,500 ¥ 5,500 ¥ 10,000 ¥ 10,000 ¥ 5,000 ¥ 5,000
Notes payable, underwriting discount $ 2 $ 2         $ 4 $ 4