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Fair Value Measurements - Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities $ 631 $ 1,103
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 52 78
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 238 197
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 32 57
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 218 190
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 20 7
Fair value on a recurring basis | Corporate debt securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 20 14
Fair value on a recurring basis | Commercial paper    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 495 899
Fair value on a recurring basis | Certificates of deposit/time deposits    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 59 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 8 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 19 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 32 57
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 218 190
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 20 7
Fair value on a recurring basis | Level 2 | Corporate debt securities    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 20 14
Fair value on a recurring basis | Level 2 | Commercial paper    
Assets and Liabilities Measured on Recurring Basis    
Available-for-sale marketable securities 495 899
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 59 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 8 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 19 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