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Investments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Interest-bearing Assets        
Cash and cash equivalents $ 286 $ 272 $ 300 $ 346
Short-term investments 516 785    
Fiduciary assets 4,676 4,190    
Investments 200 239    
Total interest-bearing assets 5,678 5,486    
Investments:        
Equity method investments 129 164    
Other investments, at cost 53 60    
Fixed-maturity securities 18 15    
Investments $ 200 $ 239