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Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Senior Notes $ 4,543 $ 4,249
Credit facility 117 58
Mortgage debt (non-recourse) secured by $1.0 billion and $1.1 billion of real estate assets, with an average interest rate of 5.0% and 4.7% at December 31, 2011 and 2010, maturing through December 2023 1,006 [1] 1,025 [1]
Other 87 145
Total debt 5,753 5,477
Series K Senior Notes 7.125 Percent Due November 2013
   
Senior Notes   250
Series O Senior Notes 6.375 Percent Due March 2015
   
Senior Notes 650 650
Series Q Senior Notes 6.75 Percent Due June 2016
   
Senior Notes 800 800
Series S Senior Notes 6.875 Percent Due November 2014
   
Senior Notes 498 498
Series T Senior Notes 9 Percent Due May 2017
   
Senior Notes 390 388
Series V Senior Notes 6 Percent Due November 2020
   
Senior Notes 500 500
Series W Senior Notes 5.875 Percent Due June 15, 2019
   
Senior Notes 496  
Series Y Senior Notes 6 Percent Due October 2021
   
Senior Notes 300  
Exchangeable 2004 Senior Debentures 3.25 Percent Due April 2024
   
Senior Notes 175 325
Exchangeable 2007 Senior Debentures 2.625 Percent Due April 2027
   
Senior Notes 385 502
Exchangeable 2009 Senior Debentures 2.5 Percent Due October 2029
   
Senior Notes 342 329
Senior Notes 10.0 Percent Due May 2012
   
Senior Notes $ 7 $ 7
[1] The amount of the assets stated above securing mortgage debt represents the book value of real estate assets, net of accumulated depreciation. These amounts do not represent the current fair value of the assets.