Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule Of Financial Instruments Measured And Recorded At Fair Value On Recurring Basis) (Details)

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Financial Instruments (Schedule Of Financial Instruments Measured And Recorded At Fair Value On Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Financial Instrument [Line Items]    
Cash equivalents $ 1,042 $ 739
Marketable securities 351 896
Long-term marketable securities 169 149
Other assets 10 10
Prepaid expenses and other current assets 1  
Total assets measured at fair value 1,573 1,794
Total liabilities measured at fair value   (2)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 917 738
Long-term marketable securities 1 9
Other assets 10 10
Total assets measured at fair value 928 757
Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 125 1
Marketable securities 319 858
Long-term marketable securities 168 140
Prepaid expenses and other current assets 1  
Total assets measured at fair value 613 999
Total liabilities measured at fair value   (2)
Significant Unobservable Inputs (Level 3) [Member]
   
Financial Instrument [Line Items]    
Marketable securities 32 38
Total assets measured at fair value 32 38
Money Market Funds [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 917 738
Long-term marketable securities 1 9
Other assets 10 10
Money Market Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 917 738
Long-term marketable securities 1 9
Other assets 10 10
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Long-term marketable securities   0
Commercial Paper [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 125 1
Marketable securities 249 698
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Cash equivalents 125 1
Marketable securities 249 698
Time Deposits [Member]
   
Financial Instrument [Line Items]    
Marketable securities 70 160
Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Marketable securities 70 160
Auction Rate Securities [Member]
   
Financial Instrument [Line Items]    
Marketable securities 32 38
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial Instrument [Line Items]    
Marketable securities 32 38
Corporate Bonds [Member]
   
Financial Instrument [Line Items]    
Long-term marketable securities 168 140
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Long-term marketable securities 168 140
Foreign Currency Derivative Contracts [Member]
   
Financial Instrument [Line Items]    
Prepaid expenses and other current assets 1  
Total liabilities measured at fair value   (2)
Foreign Currency Derivative Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial Instrument [Line Items]    
Prepaid expenses and other current assets 1  
Total liabilities measured at fair value   $ (2)