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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Money market funds $ 942 $ 3,337
Available-for-sale investments 9 15
Derivatives, assets 260 227
Total assets 1,211 3,579
Derivatives, liabilities (114) (115)
Total liabilities (114) (115)
Level 1 [Member]
   
Money market funds 942 3,337
Available-for-sale investments 5 10
Derivatives, assets    
Total assets 947 3,347
Derivatives, liabilities    
Total liabilities    
Level 2 [Member]
   
Money market funds    
Available-for-sale investments    
Derivatives, assets 260 227
Total assets 260 227
Derivatives, liabilities (114) (115)
Total liabilities (114) (115)
Level 3 [Member]
   
Money market funds    
Available-for-sale investments 4 5
Derivatives, assets    
Total assets 4 5
Derivatives, liabilities    
Total liabilities