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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 2,852 $ 2,810
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 103 72
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 58 106
Fair value on a recurring basis | Fair Value | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 88 49
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 57 105
Fair value on a recurring basis | Fair Value | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 1 1
Fair value on a recurring basis | Fair Value | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 15 23
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 365 287
Fair value on a recurring basis | Fair Value | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 73 67
Fair value on a recurring basis | Fair Value | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 806 965
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 77 41
Fair value on a recurring basis | Fair Value | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 165 116
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 896 942
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 155 157
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 123 90
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 67 39
Fair value on a recurring basis | Fair Value | U.S. treasury securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 103 72
Fair value on a recurring basis | Fair Value | U.S. municipal securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 12 27
Fair value on a recurring basis | Fair Value | Auction rate securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 10 7
Fair value on a recurring basis | Fair Value | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 3 3
Fair value on a recurring basis | Level 1 | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 88 49
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 57 104
Fair value on a recurring basis | Level 1 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 1 1
Fair value on a recurring basis | Level 1 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 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 103 72
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 3
Fair value on a recurring basis | Level 2 | Foreign currency forward/option contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 0 0
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 0 1
Fair value on a recurring basis | Level 2 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 0 0
Fair value on a recurring basis | Level 2 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 15 23
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 365 287
Fair value on a recurring basis | Level 2 | Foreign government agency securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 73 67
Fair value on a recurring basis | Level 2 | Corporate debt securities
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 806 965
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 77 41
Fair value on a recurring basis | Level 2 | Commercial paper
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 165 116
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 896 942
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 155 157
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 123 90
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 67 39
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 12 27
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    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 0 0
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 0 0
Fair value on a recurring basis | Level 3 | Commodity price swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 0 0
Fair value on a recurring basis | Level 3 | Interest rate swap contracts
   
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 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 10 7
Fair value on a recurring basis | Level 3 | Investments
   
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 0 $ 0