The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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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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Number of equity method investments.

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Equity Method Investment - Narrative (Details) kr in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) investment	Mar. 31, 2018 USD ($)	Mar. 31, 2018 SEK (kr)	Dec. 31, 2018 USD ($)	Apr. 18, 2017
Schedule of Equity Method Investments [Line Items]
Number of equity method investments \| investment	1
Loss from equity method investment	$ 17	$ 14
Equity investments after consideration of foreign exchange movements	81			$ 101
Zenuity
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint venture		50.00%	50.00%
Cash contribution to joint venture		$ 71	kr 600
Loss from equity method investment	17	$ 14
Equity investments after consideration of foreign exchange movements	$ 81			$ 101
Zenuity \| Volvo Cars
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint venture					50.00%