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Fair Value Measurements - Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 411 $ 1,103
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 130 78
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 117 197
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 110 57
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 100 190
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 20 21
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 17 7
Fair value on a recurring basis | Corporate debt securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities   14
Fair value on a recurring basis | Commercial paper    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 347 899
Fair value on a recurring basis | Certificates of deposit/time deposits    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 31 76
Fair value on a recurring basis | Asset-backed securities Automobile loan related    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 3 16
Fair value on a recurring basis | Asset-backed securities Credit card related    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities   68
Fair value on a recurring basis | U.S. municipal securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 30 30
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 110 57
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 100 190
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 20 21
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 17 7
Fair value on a recurring basis | Level 2 | Corporate debt securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities   14
Fair value on a recurring basis | Level 2 | Commercial paper    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 347 899
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 31 76
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 3 16
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   68
Fair value on a recurring basis | Level 3 | U.S. municipal securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 30 $ 30