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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.