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Pension Benefits Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair Value of Plan Assets at beginning of year $ 377    
Fair Value of Plan Assets at end of year 362 $ 377  
Liability, Defined Benefit Plan [Abstract]      
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities (445) (454)  
Domestic Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 29 40  
Interest Cost 1 1 $ 1
Actuarial Loss (Gain) 2 0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (10) (12)  
Benefit obligation at end of year 18 29 40
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair Value of Plan Assets at beginning of year 0 0  
Aptiv contributions 10 12  
Benefits Paid 10 12  
Fair Value of Plan Assets at end of year 0 0 0
Defined Benefit Plan, Underfunded Status (18) (29)  
Liability, Defined Benefit Plan [Abstract]      
Liability, Defined Benefit Plan, Current (7) (10)  
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities (11) (19)  
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities (18) (29)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax 8 9  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 8 9  
Non-U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 835 2,137  
Defined Benefit Plan, Benefit Obligation, Business Combination 25 0  
Service Cost 17 48 46
Interest Cost 23 54 63
Actuarial Loss (Gain) (4) (1)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (30) (71)  
Impact of curtailments 1 3  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment (6) 0  
Spin-Off of Delphi Technologies 0 (1,518)  
Exchange rate movements and other (62) 183  
Benefit obligation at end of year 809 835 2,137
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair Value of Plan Assets at beginning of year 377 1,212  
Defined Benefit Plan, Plan Assets, Business Combination 19 0  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (6) 75  
Aptiv contributions 38 67  
Benefits Paid 30 71  
Spin-Off of Delphi Technologies 0 (997)  
Exchange rate movements and other (36) 91  
Fair Value of Plan Assets at end of year 362 377 $ 1,212
Defined Benefit Plan, Underfunded Status (447) (458)  
Liability, Defined Benefit Plan [Abstract]      
Assets for Plan Benefits, Defined Benefit Plan 2 4  
Liability, Defined Benefit Plan, Current (17) (31)  
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities (432) (431)  
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities (447) (458)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax 143 144  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 6 1  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax $ 149 $ 145