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Fair Value Measurements and Financial Instruments - Other Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other current assets |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Marketable securities | $ 51 | $ 14
Other current assets | Bonds Issued By Argentinian Government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Marketable securities | 4 |
Assets |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-maturity securities | 4 |
Fair Value, Inputs, Level 1 | Other current assets | Deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Marketable securities | 51 |
Fair Value, Inputs, Level 2 | Assets |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-maturity securities, fair value | $ 4 |

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