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Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2011
D
M
Dec. 31, 2010
Marketable securities classification    
Current marketable securities $ 1,148 $ 1,101
Non-current marketable securities 407 540
Total marketable securities 1,555 1,641
Gross unrealized losses on marketable securities (pre-tax) 6 9
Gross unrealized gains on marketable securities (pre-tax) 2 5
U.S. government agency securities
   
Marketable securities classification    
Current marketable securities 203 246
Non-current marketable securities 57 63
Foreign government agency securities
   
Marketable securities classification    
Current marketable securities 10 52
Non-current marketable securities 3 3
Corporate debt securities
   
Marketable securities classification    
Current marketable securities 240 280
Non-current marketable securities 141 192
Commercial paper
   
Marketable securities classification    
Current marketable securities 148 55
Certificates of deposit
   
Marketable securities classification    
Current marketable securities 15  
U.S. treasury securities
   
Marketable securities classification    
Current marketable securities 15 55
Non-current marketable securities 35 44
U.S. municipal securities
   
Marketable securities classification    
Current marketable securities 12 20
Non-current marketable securities 3 3
Asset-backed securities:
   
Marketable securities classification    
Current marketable securities 444 364
Non-current marketable securities 160 228
Estimated fair value of current and long-term asset-backed securities 604  
Number of securities rated A+ or AA 4  
Estimated fair value of asset-backed securities rated A+ or AA 15  
Asset-backed securities Automobile loan related
   
Marketable securities classification    
Current marketable securities 328 253
Non-current marketable securities 96 144
Asset-backed securities Credit card related
   
Marketable securities classification    
Current marketable securities 43 79
Non-current marketable securities 50 70
Asset-backed securities Equipment lease related
   
Marketable securities classification    
Current marketable securities 56 24
Non-current marketable securities 14 14
Asset-backed securities Other asset-backed securities
   
Marketable securities classification    
Current marketable securities 17 8
Auction rate securities
   
Marketable securities classification    
Non-current marketable securities 8 7
Percentage of interests in auction rate securities to portfolio, maximum (as a percent) 1.00%  
Estimated fair value of auction-rate securities 8 7
Gross unrealized losses (pre-tax) within accumulated other comprehensive income related to auction rate securities 5 6
Minimum period that auction rate securities have been in a loss position (in months) 12  
Pre-determined intervals during which liquidity for auction rate securities is typically provided 1 (in days) 7  
Pre-determined intervals during which liquidity for auction rate securities is typically provided 2 (in days) 28  
Pre-determined intervals during which liquidity for auction rate securities is typically provided 3 (in days) 35  
Pre-determined intervals during which liquidity for auction rate securities is typically provided 4 (in days) 90  
Other securities
   
Marketable securities classification    
Current marketable securities $ 61 $ 29