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Other Non-Current Assets - Other Non-Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Available-for-sale equity securities	$ 11	$ 11
Trading equity securities	9	8
Long-term State receivables	417	388
Long-term receivables from third parties	1	1
Prepaid for pension	1
Deposits and other non-current assets	36	26
Total	$ 475	$ 434

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Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

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