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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis - Footnotes (Details) - Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term equity securities held in trust | $ 11 | $ 19
Long-term equity securities held in trust | $ 29 | $ 42

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- Definition Equity Securities, FV-NI, Restricted, Current + References No definition available. + Details
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- Definition Equity Securities, FV-NI, Restricted, Noncurrent + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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