Pension Benefits Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of year	$ 1,212
Fair Value of Plan Assets at end of year	377	$ 1,212
Liability, Defined Benefit Plan [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities	(454)	(439)
Domestic Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	40	50
Interest Cost	1	1	$ 1
Benefit obligation at end of year	29	40	50
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	12	11
Benefits Paid	12	11
Fair Value of Plan Assets at end of year	0	0	0
Defined Benefit Plan, Underfunded Status	(29)	(40)
Liability, Defined Benefit Plan [Abstract]
Liability, Defined Benefit Plan, Current	(10)	(11)
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities	(19)	(29)
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities	(29)	(40)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	9	10
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	9	10
Defined Benefit Plan, Benefit Obligation, Benefits Paid	12	11
Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,137	2,032
Spin-Off of Delphi Technologies	(1,518)
Service Cost	48	46	57
Interest Cost	54	63	77
Actuarial Loss (Gain)	(1)	363
Impact of curtailments	3	2
Exchange rate movements and other	183	(285)
Benefit obligation at end of year	835	2,137	2,032
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at beginning of year	1,212	1,209
Actual return on plan assets	75	204
Aptiv contributions	67	83
Benefits Paid	71	84
Spin-Off of Delphi Technologies	(997)
Exchange rate movements and other	91	(200)
Fair Value of Plan Assets at end of year	377	1,212	$ 1,209
Defined Benefit Plan, Underfunded Status	(458)	(925)
Liability, Defined Benefit Plan [Abstract]
Assets for Plan Benefits, Defined Benefit Plan	4	8
Liability, Defined Benefit Plan, Current	(31)	(10)
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities	(431)	(923)
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities	(458)	(925)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	144	505
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	1	1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	145	506
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ 71	$ 84