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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 2,626 $ 2,357
Derivative instruments - assets 133 135
Derivative instruments - liabilities 42 49
Fair value on a recurring basis | Fair Value | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 108 107
Derivative instruments - liabilities 38 42
Fair value on a recurring basis | Fair Value | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - liabilities 4 7
Fair value on a recurring basis | Fair Value | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 25 28
Fair value on a recurring basis | Fair Value | U.S. government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 588 480
Fair value on a recurring basis | Fair Value | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 34 23
Fair value on a recurring basis | Fair Value | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 819 668
Fair value on a recurring basis | Fair Value | Certificates of deposit/time deposits
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 36 49
Fair value on a recurring basis | Fair Value | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 254 30
Fair value on a recurring basis | Fair Value | Asset-backed securities Automobile loan related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 612 718
Fair value on a recurring basis | Fair Value | Asset-backed securities Credit card related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 135 268
Fair value on a recurring basis | Fair Value | Asset-backed securities Equipment lease related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 65 64
Fair value on a recurring basis | Fair Value | Asset-backed securities Other asset-backed securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 1 5
Fair value on a recurring basis | Fair Value | U.S. treasury securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 37 34
Fair value on a recurring basis | Fair Value | U.S. municipal securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 41 14
Fair value on a recurring basis | Fair Value | Auction rate securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 4 4
Fair value on a recurring basis | Fair Value | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 3 4
Fair value on a recurring basis | Level 1 | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 108 98
Derivative instruments - liabilities 38 42
Fair value on a recurring basis | Level 1 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - liabilities 4 7
Fair value on a recurring basis | Level 1 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 0 0
Fair value on a recurring basis | Level 1 | U.S. government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Certificates of deposit/time deposits
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Asset-backed securities Automobile loan related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Asset-backed securities Credit card related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Asset-backed securities Equipment lease related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Asset-backed securities Other asset-backed securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | U.S. treasury securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 37 34
Fair value on a recurring basis | Level 1 | U.S. municipal securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Auction rate securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 1 | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 3 4
Fair value on a recurring basis | Level 2 | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 0 9
Derivative instruments - liabilities 0 0
Fair value on a recurring basis | Level 2 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - liabilities 0 0
Fair value on a recurring basis | Level 2 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 25 28
Fair value on a recurring basis | Level 2 | U.S. government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 588 480
Fair value on a recurring basis | Level 2 | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 34 23
Fair value on a recurring basis | Level 2 | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 819 668
Fair value on a recurring basis | Level 2 | Certificates of deposit/time deposits
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 36 49
Fair value on a recurring basis | Level 2 | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 254 30
Fair value on a recurring basis | Level 2 | Asset-backed securities Automobile loan related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 612 718
Fair value on a recurring basis | Level 2 | Asset-backed securities Credit card related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 135 268
Fair value on a recurring basis | Level 2 | Asset-backed securities Equipment lease related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 65 64
Fair value on a recurring basis | Level 2 | Asset-backed securities Other asset-backed securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 1 5
Fair value on a recurring basis | Level 2 | U.S. treasury securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 2 | U.S. municipal securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 41 14
Fair value on a recurring basis | Level 2 | Auction rate securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 2 | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 0 0
Derivative instruments - liabilities 0 0
Fair value on a recurring basis | Level 3 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - liabilities 0 0
Fair value on a recurring basis | Level 3 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Derivative instruments - assets 0 0
Fair value on a recurring basis | Level 3 | U.S. government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Certificates of deposit/time deposits
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Asset-backed securities Automobile loan related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Asset-backed securities Credit card related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Asset-backed securities Equipment lease related
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Asset-backed securities Other asset-backed securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | U.S. treasury securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | U.S. municipal securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 0 0
Fair value on a recurring basis | Level 3 | Auction rate securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 4 4
Fair value on a recurring basis | Level 3 | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 0 $ 0