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Investments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Interest-bearing Assets        
Cash and cash equivalents $ 291 $ 272 $ 346 $ 217
Short-term investments 346 785    
Fiduciary assets 4,029 4,190    
Investments 165 239    
Total interest-bearing assets 4,831 5,486    
Investments:        
Equity method investments 102 164    
Other investments, at cost 43 60    
Fixed-maturity securities 20 15    
Investments $ 165 $ 239