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Fair Value of Financial Investments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair value of financial investments and liabilities    
Total financial investments $ 48us-gaap_LongTermInvestments $ 50us-gaap_LongTermInvestments
Cost basis available-for-sale securities 19us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 19us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Pre-tax unrealized gains, available-for-sale securities 3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Recorded basis, available for sale securities 22us-gaap_AvailableForSaleSecuritiesDebtSecurities 22us-gaap_AvailableForSaleSecuritiesDebtSecurities
Recurring | Level 3    
Fair value of financial investments and liabilities    
Recurring investments, Available-for-sale securities 22us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
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22us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
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Recurring | Auction rate securities | Level 3    
Fair value of financial investments and liabilities    
Recurring investments, Available-for-sale securities 22us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
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22us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
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Non-recurring investments | Private equity funds    
Fair value of financial investments and liabilities    
Non-recurring investments 12us-gaap_CostMethodInvestments
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14us-gaap_CostMethodInvestments
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Non-recurring investments | Other investments    
Fair value of financial investments and liabilities    
Non-recurring investments 3us-gaap_CostMethodInvestments
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3us-gaap_CostMethodInvestments
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Non-recurring investments | Equity method investments    
Fair value of financial investments and liabilities    
Equity method investments $ 11us-gaap_EquityMethodInvestments
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$ 11us-gaap_EquityMethodInvestments
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