Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Available-For-Sale Securities) (Details)

v2.4.0.6
Financial Instruments (Available-For-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Cash Equivalents [Member]
   
Financial Instrument [Line Items]    
Fair Value $ 1,042 $ 739
Cash Equivalents [Member] | Money Market Funds [Member]
   
Financial Instrument [Line Items]    
Fair Value 917 738
Cash Equivalents [Member] | Commercial Paper [Member]
   
Financial Instrument [Line Items]    
Fair Value 125 1
Marketable Securities [Member]
   
Financial Instrument [Line Items]    
Fair Value 351 896
Marketable Securities [Member] | Commercial Paper [Member]
   
Financial Instrument [Line Items]    
Fair Value 249 698
Marketable Securities [Member] | Time Deposits [Member]
   
Financial Instrument [Line Items]    
Fair Value 70 160
Marketable Securities [Member] | Auction Rate Securities [Member]
   
Financial Instrument [Line Items]    
Fair Value 32 38
Long-Term Marketable Securities [Member]
   
Financial Instrument [Line Items]    
Fair Value 169 149
Long-Term Marketable Securities [Member] | Money Market Funds [Member]
   
Financial Instrument [Line Items]    
Fair Value 1 9
Long-Term Marketable Securities [Member] | Corporate Bonds [Member]
   
Financial Instrument [Line Items]    
Fair Value 168 140
Other Assets [Member]
   
Financial Instrument [Line Items]    
Fair Value 10 10
Other Assets [Member] | Money Market Funds [Member]
   
Financial Instrument [Line Items]    
Fair Value $ 10 $ 10