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Fair Value Measurements (Details) (USD $)
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of cash equivalents $ 13,335,000,000 $ 14,060,000,000 $ 9,396,000,000 $ 8,716,000,000
Maturity period of primarily bank time deposits, classified as cash equivalents 90 days or less      
Maturity period of bank time deposits Greater than 90 days      
Fair value of investments not included in cash and cash equivalents 643,000,000 855,000,000    
Carrying and fair value of time deposits 4,400,000,000 2,900,000,000    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets and Liabilities Measured at Fair Value on a Recurring Basis        
Marketable securities 221,000,000 155,000,000    
Derivatives 9,000,000 11,000,000    
Total Assets at Fair Value 230,000,000 166,000,000    
Derivatives 63,000,000 75,000,000    
Total Liabilities at Fair Value 63,000,000 75,000,000    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of investments 221,000,000 155,000,000    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets and Liabilities Measured at Fair Value on a Recurring Basis        
Marketable securities 0 0    
Derivatives 116,000,000 111,000,000    
Total Assets at Fair Value 116,000,000 111,000,000    
Derivatives 39,000,000 96,000,000    
Total Liabilities at Fair Value 39,000,000 96,000,000    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of investments 0 0    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets and Liabilities Measured at Fair Value on a Recurring Basis        
Marketable securities 0 0    
Derivatives 0 0    
Total Assets at Fair Value 0 0    
Derivatives 0 0    
Total Liabilities at Fair Value 0 0    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of investments 0 0    
Fair Value, Measurements, Recurring [Member]
       
Assets and Liabilities Measured at Fair Value on a Recurring Basis        
Marketable securities 221,000,000 155,000,000    
Derivatives 125,000,000 122,000,000    
Total Assets at Fair Value 346,000,000 277,000,000    
Derivatives 102,000,000 171,000,000    
Total Liabilities at Fair Value 102,000,000 171,000,000    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of investments 221,000,000 155,000,000    
Carrying Amount of Long-term Debt [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying amount of long-term debt 5,600,000,000 5,600,000,000    
Fair Value of Long-term Debt [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying amount of long-term debt $ 6,200,000,000 $ 6,300,000,000