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Fair Value Measurements (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets $ 1,475,000,000 $ 1,365,000,000
Fair Value of Derivative Liabilities 400,000,000 286,000,000
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 207,000,000 241,000,000
Marketable securities 4,111,000,000 3,835,000,000
Fair Value of Derivative Assets 1,475,000,000 1,365,000,000
Total assets at fair value 5,793,000,000 5,441,000,000
Fair Value of Derivative Liabilities 400,000,000 286,000,000
Total liabilities at fair value 400,000,000 286,000,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Par value assets excluded from fair value by input 4,800,000,000 5,700,000,000
Fair Value, Measurements, Recurring [Member] | Cash [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Par value assets excluded from fair value by input 2,100,000,000 2,800,000,000
Fair Value, Measurements, Recurring [Member] | U.S. Government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 1,000,000 1,000,000
Marketable securities 2,071,000,000 619,000,000
Fair Value, Measurements, Recurring [Member] | U.S. government-sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 167,000,000 75,000,000
Marketable securities 449,000,000 713,000,000
Fair Value, Measurements, Recurring [Member] | Non-U.S. government agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 5,000,000 150,000,000
Marketable securities 175,000,000 778,000,000
Fair Value, Measurements, Recurring [Member] | Corporate debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 18,000,000 0
Marketable securities 1,206,000,000 1,186,000,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed and other asset-backed [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 73,000,000 88,000,000
Fair Value, Measurements, Recurring [Member] | Non-U.S. government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 16,000,000 15,000,000
Marketable securities 121,000,000 444,000,000
Fair Value, Measurements, Recurring [Member] | Other liquid investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 16,000,000 7,000,000
Fair Value, Measurements, Recurring [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 1,453,000,000 1,163,000,000
Fair Value of Derivative Liabilities 284,000,000 237,000,000
Fair Value, Measurements, Recurring [Member] | Foreign currency exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 22,000,000 53,000,000
Fair Value of Derivative Liabilities 33,000,000 37,000,000
Fair Value, Measurements, Recurring [Member] | Cross-currency interest rate swap contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 12,000,000
Fair Value of Derivative Liabilities 83,000,000 12,000,000
Fair Value, Measurements, Recurring [Member] | Other [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 137,000,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 1,000,000 1,000,000
Marketable securities 2,071,000,000 619,000,000
Fair Value of Derivative Assets 0 0
Total assets at fair value 2,072,000,000 620,000,000
Fair Value of Derivative Liabilities 0 0
Total liabilities at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 1,000,000 1,000,000
Marketable securities 2,071,000,000 619,000,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. government-sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-U.S. government agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-backed and other asset-backed [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-U.S. government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liquid investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign currency exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cross-currency interest rate swap contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 206,000,000 240,000,000
Marketable securities 2,040,000,000 3,216,000,000
Fair Value of Derivative Assets 1,475,000,000 1,228,000,000
Total assets at fair value 3,721,000,000 4,684,000,000
Fair Value of Derivative Liabilities 400,000,000 286,000,000
Total liabilities at fair value 400,000,000 286,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. government-sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 167,000,000 75,000,000
Marketable securities 449,000,000 713,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-U.S. government agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 5,000,000 150,000,000
Marketable securities 175,000,000 778,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 18,000,000 0
Marketable securities 1,206,000,000 1,186,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-backed and other asset-backed [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 73,000,000 88,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-U.S. government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 16,000,000 15,000,000
Marketable securities 121,000,000 444,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liquid investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 16,000,000 7,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 1,453,000,000 1,163,000,000
Fair Value of Derivative Liabilities 284,000,000 237,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign currency exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 22,000,000 53,000,000
Fair Value of Derivative Liabilities 33,000,000 37,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross-currency interest rate swap contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 12,000,000
Fair Value of Derivative Liabilities 83,000,000 12,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value of Derivative Assets 0 137,000,000
Total assets at fair value 0 137,000,000
Fair Value of Derivative Liabilities 0 0
Total liabilities at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. government-sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-U.S. government agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage-backed and other asset-backed [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-U.S. government [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Cash equivalents - financial instruments 0 0
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liquid investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Marketable securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign currency exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Cross-currency interest rate swap contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets 0 0
Fair Value of Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair Value of Derivative Assets $ 0 $ 137,000,000