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Investments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Interest-bearing Assets        
Cash and cash equivalents $ 323 $ 272 $ 682 $ 346
Short-term investments 510 785    
Fiduciary assets 4,354 4,190    
Investments 211 239    
Total interest-bearing assets 5,398 5,486    
Investments:        
Equity method investments 135 164    
Other investments, at cost 61 60    
Fixed-maturity securities 15 15    
Investments $ 211 $ 239