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Financial Instruments and Risk Management (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI $ (71) $ 65
Gain (loss) reclassified from OCI into earnings 123 (59)
Derivative instruments not designated as a hedge [Member]
   
The effect on the consolidated statements of income of derivative instruments    
Gain(loss) on financial assets 31 (41)
Derivative instruments not designated as hedge    
Gain(loss) on financial assets 31 (41)
Gain (loss) on financial instruments, net [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) reclassified from OCI into earnings 6  
Forward contracts [Member] | Other income and expenses net [Member] | Derivative instruments not designated as a hedge [Member]
   
The effect on the consolidated statements of income of derivative instruments    
Gain(loss) on financial assets 31 (41)
Derivative instruments not designated as hedge    
Gain(loss) on financial assets 31 (41)
Forward contracts [Member] | Cost of Sales [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (16) 19
Gain (loss) reclassified from OCI into earnings 67 (31)
Forward contracts [Member] | Selling general and administrative [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (2) 3
Gain (loss) reclassified from OCI into earnings 8 (6)
Forward contracts [Member] | Research and development [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (20) 16
Gain (loss) reclassified from OCI into earnings 45 (32)
Currency options [Member] | Cost of Sales [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (2) (1)
Gain (loss) reclassified from OCI into earnings (3) (6)
Currency options [Member] | Selling general and administrative [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) reclassified from OCI into earnings   (1)
Currency options [Member] | Research and development [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (1) (1)
Gain (loss) reclassified from OCI into earnings (1) (3)
Collars [Member] | Cost of Sales [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (19)  
Gain (loss) reclassified from OCI into earnings 1  
Collars [Member] | Selling general and administrative [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (3)  
Collars [Member] | Research and development [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI (8) 2
Combined options [Member] | Gain (loss) on financial instruments, net [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) reclassified from OCI into earnings   4
Contingent zero-cost collars [Member] | Gain (loss) on financial instruments, net [Member] | Derivative instruments designated as cash flow hedge [Member]
   
Derivative instruments designated as Cash Flow hedge    
Gain (loss) deferred in OCI   27
Gain (loss) reclassified from OCI into earnings   $ 16