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Marketable Securities (Details Textual)
In Millions, unless otherwise specified
 1 Months Ended 2 Months Ended 12 Months Ended
Jan. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
USD ($)
Y
Investment
Dec. 31, 2011
EUR (€)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Jun. 09, 2011
USD ($)
May 07, 2010
Dec. 31, 2011
Moody's Aaa Rating [Member]
USD ($)
Dec. 31, 2011
Moody's A2 Rating [Member]
USD ($)
Marketable Securities (Textual) [Abstract]                    
Carrying amount of government bonds   $ 1,124 $ 413   $ 1,124 $ 1,074     $ 100 $ 81
Purchase     352   1,100 1,730        
Marketable Securities (Additional Textual) [Abstract]                    
Pre-tax unrealized loss     6              
Other-than-temporary impairment charge representing certain percentage of face value of debt securities     50.00% 50.00%            
Other-than-temporary impairment charge and realized gain on financial assets     5              
Other than temporary impairment charge as percentage of floating rate notes     75.00% 75.00%            
Unauthorized auction rate net cash payment             350      
Minimum duration of government debt securities portfolio     4 months 4 months            
Recognized pre tax gain on non current marketable securities     329              
Pre-tax gain on Selling, general and administrative     6              
Non-operating gain on sale of financial instruments     323              
Disposition of investment in exchange for shares               67    
Marketable Securities Shares Sold   47                
Remaining Marketable Securities Shares Sold 20                  
Amount invested in French, German, Italian and U.S. government bonds     352   1,100 1,730        
Auction Rate Securities collected as realized losses on financial assets 189   818   1,219 1,371        
Senior floating rate note whose impairment was recorded as other than temporary       15            
Non-operating gain on sale of financial instruments 14   25   (24) (5)        
Duration of the floating rate note portfolio     0.99 0.99            
Debt securities fair value     5              
Investment positions in floating-rate notes     8 8            
Gain on the proceeds of the unwinding of derivative instruments     6              
Aggregate amortized cost basis of securities   342 252   342          
Number of Unrealized loss position in unrealized loss position     5 5            
Disposal of financial instrument     6     26        
Gain on reversal of deferred loss on remaining shares included in accumulated other comprehensive income   $ 14     $ 14