Segment Reporting Reconciliation of Adjusted OI to Net Income (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income				$ 1,230	$ 867	$ 1,548
Restructuring				(24)	(136)	(148)
Other acquisition and portfolio project costs				(15)	(23)	(71)
Asset impairments				(2)	(10)	(11)
Deferred compensation related to acquisitions					14	42
Gain on autonomous driving joint venture				0	1,434	0
Operating income		$ 260	$ 446	1,189	2,118	1,276
Interest expense				(150)	(164)	(164)
Other (expense) income, net				(129)	0	14
Income before income taxes and equity (loss) income				910	1,954	1,126
Income tax expense				(101)	(49)	(132)
Equity (loss) income, net of tax				(200)	(83)	15
Net income				609	1,822	1,009
Net income attributable to noncontrolling interest				19	18	19
Net income attributable to Aptiv		$ 31	$ 299	590	1,804	990
Intersegment Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income	[1]			0	0	0
Operating income	[1]			0	0	0
Equity (loss) income, net of tax	[1]			0	0	0
Signal and Power Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring				(8)	(90)	(104)
Signal and Power Solutions | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income				1,084	762	1,274
Restructuring				(8)	(90)	(104)
Other acquisition and portfolio project costs				(11)	(12)	(44)
Asset impairments				(1)	(4)	(2)
Deferred compensation related to acquisitions					0	0
Gain on autonomous driving joint venture					0
Operating income				1,064	656	1,124
Equity (loss) income, net of tax				15	15	15
Advanced Safety and User Experience
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring				(16)	(46)	(44)
Advanced Safety and User Experience | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income				146	105	274
Restructuring				(16)	(46)	(44)
Other acquisition and portfolio project costs				(4)	(11)	(27)
Asset impairments				(1)	(6)	(9)
Deferred compensation related to acquisitions					14	42
Gain on autonomous driving joint venture					1,434
Operating income				125	1,462	152
Equity (loss) income, net of tax				$ (215)	$ (98)	$ 0

[1] Eliminations and Other includes the elimination of inter-segment transactions. Capital expenditures amounts are attributable to corporate administrative and support functions, including corporate headquarters and certain technical centers.(2)Includes charges recorded in 2021 related to costs associated with employee termination benefits and other exit costs of $8 million for Signal and Power Solutions and $16 million for Advanced Safety and User Experience.