Supplemental Guarantor And Non-Guarantor Condensed Consolidating Financial Statements Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	[1]	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 277	$ 413		$ 386	$ 352	$ 306	$ 306	$ 271	$ 443	$ 1,428	$ 1,326	$ 1,535
Currency translation adjustments										315	(147)	(344)
Net change in unrecognized gain (loss) on derivative instruments, net of tax										15	95	(28)
Employee benefit plans adjustment, net of tax										11	(139)	64
Other comprehensive income (loss)										341	(191)	(308)
Equity In other comprehensive income (loss) of subsidiaries										0	0	0
Comprehensive income										1,769	1,135	1,227
Comprehensive income attributable to noncontrolling interests										83	60	69
Comprehensive income attributable to Aptiv										1,686	1,075	1,158
Reportable Legal Entities | Parent
Net income										1,355	1,257	1,450
Currency translation adjustments										(177)	65	(5)
Net change in unrecognized gain (loss) on derivative instruments, net of tax										0	0	0
Employee benefit plans adjustment, net of tax										0	0	0
Other comprehensive income (loss)										(177)	65	(5)
Equity In other comprehensive income (loss) of subsidiaries										508	(247)	(287)
Comprehensive income										1,686	1,075	1,158
Comprehensive income attributable to noncontrolling interests										0	0	0
Comprehensive income attributable to Aptiv										1,686	1,075	1,158
Reportable Legal Entities | Subsidiary Guarantors
Net income										1,685	1,435	1,607
Currency translation adjustments										0	0	0
Net change in unrecognized gain (loss) on derivative instruments, net of tax										0	0	0
Employee benefit plans adjustment, net of tax										0	0	0
Other comprehensive income (loss)										0	0	0
Equity In other comprehensive income (loss) of subsidiaries										(218)	(371)	(449)
Comprehensive income										1,467	1,064	1,158
Comprehensive income attributable to noncontrolling interests										0	0	0
Comprehensive income attributable to Aptiv										1,467	1,064	1,158
Reportable Legal Entities | Subsidiary Issuer/Guarantor
Net income										(46)	271	409
Currency translation adjustments										0	0	0
Net change in unrecognized gain (loss) on derivative instruments, net of tax										0	0	0
Employee benefit plans adjustment, net of tax										0	0	0
Other comprehensive income (loss)										0	0	0
Equity In other comprehensive income (loss) of subsidiaries										31	2	(9)
Comprehensive income										(15)	273	400
Comprehensive income attributable to noncontrolling interests										0	0	0
Comprehensive income attributable to Aptiv										(15)	273	400
Reportable Legal Entities | Non-Guarantor Subsidiaries
Net income										1,802	1,887	1,732
Currency translation adjustments										492	(212)	(339)
Net change in unrecognized gain (loss) on derivative instruments, net of tax										15	95	(28)
Employee benefit plans adjustment, net of tax										11	(139)	64
Other comprehensive income (loss)										518	(256)	(303)
Equity In other comprehensive income (loss) of subsidiaries										0	0	0
Comprehensive income										2,320	1,631	1,429
Comprehensive income attributable to noncontrolling interests										83	60	69
Comprehensive income attributable to Aptiv										2,237	1,571	1,360
Eliminations
Net income										(3,368)	(3,524)	(3,663)
Currency translation adjustments										0	0	0
Net change in unrecognized gain (loss) on derivative instruments, net of tax										0	0	0
Employee benefit plans adjustment, net of tax										0	0	0
Other comprehensive income (loss)										0	0	0
Equity In other comprehensive income (loss) of subsidiaries										(321)	616	745
Comprehensive income										(3,689)	(2,908)	(2,918)
Comprehensive income attributable to noncontrolling interests										0	0	0
Comprehensive income attributable to Aptiv										$ (3,689)	$ (2,908)	$ (2,918)

[1] In the fourth quarter of 2016, Aptiv recorded restructuring charges totaling $62 million, which includes employee-related and other costs.