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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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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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