Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 244 $ 859
Short term marketable securities 296 15
Available-for-sale securities 1,062 1,293
Financial instrument assets 330 397
Debt 983 1,002
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 214 859
Short term marketable securities   15
Available-for-sale securities 987 978
Financial instrument assets 31  
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 30  
Short term marketable securities 296  
Available-for-sale securities 75 315
Financial instrument assets 299 397
Debt $ 983 $ 1,002