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Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 04, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 0 | $ 0
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ (9) |  |
Components of net periodic benefit cost other than service cost |  |  | 18 | 32 | 18
Distribution Date |  | Dec. 04, 2017 |  |  |
Investment Income, Dividend |  |  | 12 | 15 | 17
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  |  | 72 | 56 |
Research and Development expense |  |  | 1,200 | 900 | 800
Allowance for Doubtful Accounts Receivable |  |  | 38 | 34 |
Provision for Doubtful Accounts |  |  | 9 | 23 | 22
Reimbursable engineering costs |  |  | 184 | 99 |
Property Plant & Equipment, net | [1] |  | 3,179 | 2,804 | 2,325
Foreign Currency Transaction Gain (Loss), Net of Tax |  |  | 8 | (13) | $ 11
Asset Retirement Obligation |  |  | 1 | 1 |
Unamortized Revolving Credit Facility debt issuance costs |  |  | 6 | 8 |
Operating Leases, Minimum Lease Commitments |  |  | 514 |  |
GM |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts and Other Receivables |  |  | 169 | 204 |
VW |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts and Other Receivables |  |  | $ 149 | $ 145 |
Customer Concentration Risk | Total Net Sales | GM & VW |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Total Net Sales |  |  | 20.00% | 22.00% | 25.00%
Customer Concentration Risk | Total Net Sales | GM |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Total Net Sales | [2] |  | 11.00% | 13.00% | 16.00%
Customer Concentration Risk | Total Net Sales | VW |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Total Net Sales |  |  | 9.00% | 9.00% | 9.00%
Special Tools |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property Plant & Equipment, net |  |  | $ 461 | $ 445 |
Aptiv-Owned Special Tools |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property Plant & Equipment, net |  |  | 352 | 338 |
Customer-Owned Special Tools |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property Plant & Equipment, net |  |  | 109 | 107 |
Other Long-Term Assets |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  |  | 72 | $ 56 |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | 420 |  |
Operating Lease, Liability, Current |  |  | 85 |  |
Operating Lease, Liability, Noncurrent |  |  | 335 |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | 460 |  |
Operating Lease, Liability, Current |  |  | 105 |  |
Operating Lease, Liability, Noncurrent |  |  | $ 355 |  |
[1] | Net property data represents property, plant and equipment, net of accumulated depreciation.
[2] | Net sales to GM includes net sales to GM’s former European Opel business prior to its sale to PSA on August 1, 2017, after which date these sales are excluded from net sales to GM.

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