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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 1,872 $ 2,209
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 198 84
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 64 110
Fair value on a recurring basis | Foreign currency forward/option contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 175 75
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 50 103
Fair value on a recurring basis | Commodity price swap contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet   1
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 3  
Fair value on a recurring basis | Interest rate swap contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 23 8
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 11 7
Fair value on a recurring basis | U.S. government agency securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 148 234
Fair value on a recurring basis | Foreign government agency securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 105 125
Fair value on a recurring basis | Corporate debt securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 789 781
Fair value on a recurring basis | Certificates of deposit/time deposits
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 43 40
Fair value on a recurring basis | Commercial paper
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 14 60
Fair value on a recurring basis | Asset-backed securities Automobile loan related
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 383 585
Fair value on a recurring basis | Asset-backed securities Credit card related
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 192 180
Fair value on a recurring basis | Asset-backed securities Equipment lease related
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 72 67
Fair value on a recurring basis | Asset-backed securities Other asset-backed securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 65 75
Fair value on a recurring basis | U.S. treasury securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 49 49
Fair value on a recurring basis | U.S. municipal securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities   2
Fair value on a recurring basis | Auction rate securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 12 11
Fair value on a recurring basis | Investments
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 1 2
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 175 75
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 50 103
Fair value on a recurring basis | Level 1 | Commodity price swap contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet   1
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 3  
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
Gross Amounts of Derivative Liabilities 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 49 49
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
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 1 2
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 0
Fair value on a recurring basis | Level 2 | Commodity price swap contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet   0
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 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 23 8
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 11 7
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 148 234
Fair value on a recurring basis | Level 2 | Foreign government agency securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 105 125
Fair value on a recurring basis | Level 2 | Corporate debt securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 789 781
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 43 40
Fair value on a recurring basis | Level 2 | Commercial paper
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 14 60
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 383 585
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 192 180
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 72 67
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 65 75
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   2
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 Assets Presented in the Consolidated Balance Sheet   0
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 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
Gross Amounts of Derivative Liabilities 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
Fair value on a recurring basis | Level 3 | Auction rate securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 12 11
Fair value on a recurring basis | Level 3 | Investments
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 0 $ 0