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Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Preproduction costs related to long-term supply agreements with contractual guarantee for reimbursement	$ 689	$ 420
Long-term receivables	180	229
Pension overfunded status	23	21
Unrealized gain on cash flow hedges	46	6
Other, net	21	43
Total other assets	$ 959	$ 719

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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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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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