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Fair Value Measurements and Financial Instruments - Other Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other current assets |  |
Schedule of Available for Sale Securities [Line Items] |  |
Marketable securities | $ 14 | $ 23
Assets |  |
Schedule of Available for Sale Securities [Line Items] |  |
Held-to-maturity securities | 4 | 52
Bonds Issued By Argentinian Government | Other current assets |  |
Schedule of Available for Sale Securities [Line Items] |  |
Marketable securities | 4 |
Fair Value, Inputs, Level 1 | Deposits | Other current assets |  |
Schedule of Available for Sale Securities [Line Items] |  |
Marketable securities | 14 |
Fair Value, Inputs, Level 2 | Assets |  |
Schedule of Available for Sale Securities [Line Items] |  |
Held-to-maturity securities, fair value | $ 4 | $ 64

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