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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 2,220 $ 2,209
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 76 84
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 56 110
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 65 75
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 56 103
Fair value on a recurring basis | Fair Value | Commodity price swap contracts
    
Assets and Liabilities Measured on Recurring Basis    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 2 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 9 8
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet   7
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 221 234
Fair value on a recurring basis | Fair Value | Foreign government agency securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 120 125
Fair value on a recurring basis | Fair Value | Corporate debt securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 815 781
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 29 40
Fair value on a recurring basis | Fair Value | Commercial paper
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 1 60
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 595 585
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 241 180
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 69 67
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 68 75
Fair value on a recurring basis | Fair Value | U.S. treasury securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 49 49
Fair value on a recurring basis | Fair Value | U.S. municipal securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities   2
Fair value on a recurring basis | Fair Value | Auction rate securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 12 11
Fair value on a recurring basis | Fair Value | 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 65 75
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 56 103
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 2 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
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet   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 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 9 8
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet   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 221 234
Fair value on a recurring basis | Level 2 | Foreign government agency securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 120 125
Fair value on a recurring basis | Level 2 | Corporate debt securities
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 815 781
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 29 40
Fair value on a recurring basis | Level 2 | Commercial paper
    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 1 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 595 585
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 241 180
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 69 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 68 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 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
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