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Other Financial Information - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities | $ 23,453 | $ 29,587
Prepaid and other current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities | $ 470 |

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