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Fair Value Measurements - Summary of Classification on Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total | $ 6,102 | $ 5,465
Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | 5,138 | 4,714
Prepaid and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | 829 | 637
Other long-term assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | $ 135 | $ 114

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