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Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Schedule of Revenue by Major Customers by Reporting Segments | Customer concentrations—As reflected in the table below, combined net sales to General Motors Company (“GM”) and Volkswagen Group (“VW”), Aptiv’s two largest customers, totaled approximately 19% and 19% of our total net sales for the three and nine months ended September 30, 2018, respectively, and 22% and 23% for the three and nine months ended September 30, 2017, respectively.
| Percentage of Total Net Sales |  |  | Accounts and Other Receivables
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  |  | September 30, 2018 |  | December 31, 2017
| 2018 |  | 2017 |  | 2018 |  | 2017 |  |  |
|  |  |  |  |  |  |  |  |  | (in millions)
GM (1) | 11 | % |  | 12 | % |  | 11 | % |  | 14 | % |  |  | $ | 239 |  |  | $ | 204 |
VW | 8 | % |  | 10 | % |  | 8 | % |  | 9 | % |  |  | 157 |  |  | 145 |
(1) | Net sales to GM includes net sales to GM’s former European Opel business prior to its sale to PSA Peugeot Citroën (“PSA”) on August 1, 2017, after which date these sales are excluded from net sales to GM.

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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