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Fair Value of Financial Investments and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair value of financial investments and liabilities    
Total equity method investments $ 68 $ 70
Total financial investments 110 113
Cost basis available-for-sale securities 19 19
Pre-tax unrealized gains, available-for-sale securities 3 3
Recorded basis, available for sale securities 22 22
Equity method investments
   
Fair value of financial investments and liabilities    
Total equity method investments 68 70
Recurring investments | Level 3
   
Fair value of financial investments and liabilities    
Recurring investments, Available-for-sale securities 22 22
Recurring investments | Auction rate securities | Level 3
   
Fair value of financial investments and liabilities    
Recurring investments, Available-for-sale securities 22 22
Non-recurring investments
   
Fair value of financial investments and liabilities    
Non-recurring investments 20 21
Non-recurring investments | Private equity funds
   
Fair value of financial investments and liabilities    
Non-recurring investments 17 18
Non-recurring investments | Other investments
   
Fair value of financial investments and liabilities    
Non-recurring investments $ 3 $ 3