For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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.

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Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| Segment	1
Long-lived assets, Total	$ 3,436	$ 3,390
UNITED STATES
Segment Reporting Information [Line Items]
External sales	1,943	1,689	$ 1,862
Long-lived assets, Total	1,527	1,601
Long-lived intangible assets from acquisition goodwill	1,250	1,263
Exports from U.S. to other Regions
Segment Reporting Information [Line Items]
External sales	$ 384	$ 362	$ 423
Customer Concentration Risk \| Sales \| Renault
Segment Reporting Information [Line Items]
Percentage of sales to individuals	15.00%	15.00%	12.00%
Customer Concentration Risk \| Sales \| VW
Segment Reporting Information [Line Items]
Percentage of sales to individuals	10.00%
Customer Concentration Risk \| Sales \| Ford
Segment Reporting Information [Line Items]
Percentage of sales to individuals		10.00%	10.00%
Customer Concentration Risk \| Sales \| Hyundai
Segment Reporting Information [Line Items]
Percentage of sales to individuals			10.00%