Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended																		12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Net sales	$ 3,440		$ 3,148		$ 3,153		$ 3,143		$ 3,193		$ 3,039		$ 3,084		$ 2,958				$ 12,884		$ 12,274		$ 10,864
Cost of sales	2,730	[1]	2,498		2,498		2,544		2,325		2,402		2,423		2,377				10,270		9,527		8,691
Gross profit	710		650		655		599		868		637		661		581				2,614		2,747
Operating income	386		373		364	[2]	293		525	[3]	335		376		303				1,416	[4]	1,539	[5]	1,235	[6]
Income from continuing operations	222		306		306		229		197		202		253		216				1,063		868		852
Income from discontinued operations, net of tax	55		107		80		123	[7]	109		104		18		227				365		458		683
Net income	277		413	[8]	386		352		306		306		271		443				1,428		1,326		1,535
Net income attributable to Aptiv	$ 256		$ 395		$ 369		$ 335		$ 281		$ 293		$ 258		$ 425				$ 1,355		$ 1,257		$ 1,450
Income from continuing operations, per basic share	$ 0.78	[9]	$ 1.11	[9]	$ 1.11	[9]	$ 0.82	[9]	$ 0.67	[9]	$ 0.72	[9]	$ 0.91	[9]	$ 0.76	[9]			$ 3.82	[9]	$ 3.05	[9]	$ 2.85
Income from discontinued operations, per basic share	0.18	[9]	0.37	[9]	0.27	[9]	0.42	[9]	0.37	[9]	0.36	[9]	0.04	[9]	0.78	[9]			1.25	[9]	1.55	[9]	2.23
Basic net income per share attributable to Aptiv	$ 0.96	[9]	$ 1.48	[9]	$ 1.38	[9]	$ 1.24	[9]	$ 1.04	[9]	$ 1.08	[9]	$ 0.95	[9]	$ 1.54	[9]			$ 5.07	[9]	$ 4.60	[9]	$ 5.08
Weighted average number of basic shares outstanding	265,840		266,240		267,410		269,200		270,380		272,190		272,920		276,620				267,160		273,020		285,200
Income from continuing operations, per diluted share	$ 0.77	[9]	$ 1.11	[9]	$ 1.11	[9]	$ 0.82	[9]	$ 0.67	[9]	$ 0.72	[9]	$ 0.90	[9]	$ 0.75	[9]			$ 3.81	[9]	$ 3.05	[9]	$ 2.84
Income from discontinued operations, per diluted share	0.18	[9]	0.37	[9]	0.27	[9]	0.42	[9]	0.36	[9]	0.35	[9]	0.04	[9]	0.78	[9]			1.25	[9]	1.54	[9]	2.22
Diluted net income per share attributable to Aptiv	$ 0.95	[9]	$ 1.48	[9]	$ 1.38	[9]	$ 1.24	[9]	$ 1.03	[9]	$ 1.07	[9]	$ 0.94	[9]	$ 1.53	[9]			$ 5.06	[9]	$ 4.59	[9]	$ 5.06
Weighted average number of diluted shares outstanding	267,440		267,160		268,030		269,540		271,640		272,770		273,370		277,040				268,030		273,700		286,640
Gain (loss) on business divestitures																					$ 141		$ (8)
Restructuring							$ 52												$ 129		167		65
Gain (loss) on divestiture of discontinued operations, net of tax															$ 104				0		104		318
Loss on extinguishment of debt											$ (73)								0		(73)		(58)
Loss Contingency Accrual, Provision																			10		300		0
Unsecured Creditors Litigation
Loss Contingency Accrual, Provision																			$ 10
Other income (expense), net | Unsecured Creditors Litigation | Judicial Ruling
Loss Contingency Accrual, Provision																					$ 300
Mechatronics Business
Gain (loss) on business divestitures	$ 141
Thermal Systems | Discontinued Operations, Disposed of by Sale
Gain (loss) on divestiture of discontinued operations, net of tax																							271
Thermal Systems | KDAC | Discontinued Operations, Disposed of by Sale
Gain (loss) on divestiture of discontinued operations, net of tax																	$ 47						$ (41)
Impairment loss on KDAC interest																		$ 88

[1] In the first quarter of 2017, Aptiv recorded restructuring charges totaling $52 million, which includes employee-related and other costs, $36 million of which related to the initiation of the closure of a European manufacturing site within the Advanced Safety and User Experience segment.

[2] Due to the use of the weighted average shares outstanding for each quarter for computing earnings per share, the sum of the quarterly per share amounts may not equal the per share amount for the year.

[3] In the third quarter of 2016, Aptiv recognized losses on the extinguishment of debt of $73 million. In the fourth quarter of 2016, Aptiv recorded a reserve of $300 million for the Unsecured Creditors litigation.

[4] Includes charges recorded in 2017 related to costs associated with employee termination benefits and other exit costs of $67 million for Signal and Power Solutions and $62 million for Advanced Safety and User Experience.

[5] Includes a pre-tax gain of $141 million from the divestiture of the Advanced Safety and User Experience Mechatronics business, as well as charges recorded in 2016 related to costs associated with employee termination benefits and other exit costs of $125 million for Signal and Power Solutions and $42 million for Advanced Safety and User Experience.

[6] Includes charges recorded in 2015 related to costs associated with employee termination benefits and other exit costs of $39 million for Signal and Power Solutions and $26 million for Advanced Safety and User Experience.

[7] In the fourth quarter of 2016, Aptiv recognized a pre-tax gain of $141 million on the divestiture of its Mechatronics business.

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

[9] In the first quarter of 2016, Aptiv recognized an after-tax gain on the divestiture of discontinued operations of $104 million.