Consolidated Statements Of Comprehensive Income - 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
Statement of Comprehensive Income [Abstract]
Net income	$ 277	$ 413		$ 386	$ 352	$ 306	$ 306	$ 271	$ 443	$ 1,428	$ 1,326	$ 1,535
Other comprehensive income (loss):
Currency translation adjustments										315	(147)	(344)
Net change in unrecognized gain (loss) on derivative instruments, net of tax (Note 17)										15	95	(28)
Employee benefit plans adjustment, net of tax (Note 12)										11	(139)	64
Other comprehensive income (loss)										341	(191)	(308)
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

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