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Debt (Detail) (USD $)
In Millions
Dec. 31, 2010
Dec. 31, 2009
Debt Disclosure [Line Items]    
Senior Notes $ 4,249 $ 4,534
Credit facility 58  
Mortgage debt (non-recourse) secured by $1.1 billion and $1.5 billion of real estate assets, with an average interest rate of 4.7% and 5.1% at December 31, 2010 and 2009, maturing through December 2023 1,025 [1] 1,217 [1]
Other 145 86
Total debt 5,477 5,837
Series K Senior Notes 7.125 Percent Due November 2013
   
Debt Disclosure [Line Items]    
Senior Notes 250 725
Series M Senior Notes 7 Percent Due August 2012
   
Debt Disclosure [Line Items]    
Senior Notes   344
Series O Senior Notes 6.375 Percent Due March 2015
   
Debt Disclosure [Line Items]    
Senior Notes 650 650
Series Q Senior Notes 6.75 Percent Due June 2016
   
Debt Disclosure [Line Items]    
Senior Notes 800 800
Series S Senior Notes 6.875 Percent Due November 2014
   
Debt Disclosure [Line Items]    
Senior Notes 498 498
Series T Senior Notes 9 Percent Due May 2017
   
Debt Disclosure [Line Items]    
Senior Notes 388 387
Series U Senior Notes 6 Percent Due November 1st 2020
   
Debt Disclosure [Line Items]    
Senior Notes 500  
Exchangeable 2004 Senior Debentures 3.25 Percent Due April 2024
   
Debt Disclosure [Line Items]    
Senior Notes 325 323
Exchangeable 2007 Senior Debentures 2.625 Percent Due April 2027
   
Debt Disclosure [Line Items]    
Senior Notes 502 484
Exchangeable 2009 Senior Debentures 2.5 Percent Due October 2029
   
Debt Disclosure [Line Items]    
Senior Notes 329 316
Senior Notes 10.0 Percent Due May 2012
   
Debt Disclosure [Line Items]    
Senior Notes $ 7 $ 7
[1] The assets 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.