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Investments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Interest-bearing Assets        
Cash and cash equivalents $ 272 $ 346 $ 217 $ 582
Short-term investments 785 785    
Fiduciary assets 4,190 3,489    
Investments 239 312    
Total interest-bearing assets 5,486 4,932    
Investments:        
Equity method investments 164 174    
Other investments, at cost 60 123    
Fixed-maturity securities 15 15    
Investments 239 312    
Juniperus Insurance Opportunity Fund Limited (Juniperus)
       
Variable Interest Entity        
Investment in variable interest entity $ 65.0