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Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
D
M
Dec. 31, 2011
Marketable securities classification    
Current marketable securities $ 1,399 $ 1,461
Non-current marketable securities 763 896
Total marketable securities 2,162 2,357
Gross unrealized losses on marketable securities (pre-tax) 9 12
Gross unrealized gains on marketable securities (pre-tax) 4 3
Fair market value of asset-backed securities rated AAA/A3 or AAA/Aa3 5  
Number of asset-backed securities rated AAA/A3 or AAA/Aa3 2  
Number of asset-backed securities rated AAA/A3 1  
Number of asset-backed securities rated AAA/Aa3 1  
U.S. government agency securities
   
Marketable securities classification    
Current marketable securities 105 119
Non-current marketable securities 257 361
Foreign government agency securities
   
Marketable securities classification    
Current marketable securities 3 8
Non-current marketable securities   15
Corporate debt securities
   
Marketable securities classification    
Current marketable securities 360 413
Non-current marketable securities 275 255
Commercial paper
   
Marketable securities classification    
Current marketable securities 70 30
Certificates of deposit/time deposits
   
Marketable securities classification    
Current marketable securities 58 49
U.S. treasury securities
   
Marketable securities classification    
Current marketable securities 20  
Non-current marketable securities 39 34
U.S. municipal securities
   
Marketable securities classification    
Current marketable securities 14 9
Non-current marketable securities 5 5
Asset-backed securities:
   
Marketable securities classification    
Current marketable securities 769 833
Non-current marketable securities 182 222
Estimated fair value of current and long-term securities 951  
Asset-backed securities Automobile loan related
   
Marketable securities classification    
Current marketable securities 484 530
Non-current marketable securities 99 188
Asset-backed securities Credit card related
   
Marketable securities classification    
Current marketable securities 220 244
Non-current marketable securities 39 24
Asset-backed securities Equipment lease related
   
Marketable securities classification    
Current marketable securities 59 54
Non-current marketable securities 44 10
Asset-backed securities Other asset-backed securities
   
Marketable securities classification    
Current marketable securities 6 5
Auction rate securities
   
Marketable securities classification    
Non-current marketable securities 5 4
Gross unrealized losses on marketable securities (pre-tax) 8 9
Estimated fair value of current and long-term securities $ 5 $ 4
Percentage of interests in auction rate securities to portfolio, maximum (as a percent) 1.00%  
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