Supplemental Guarantor And Non-Guarantor Condensed Consolidating Financial Statements Statement of Operations (Details) - USD ($) $ 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	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
Selling, general and administrative														952		924		803
Amortization														117		117		70
Restructuring							52							129		167		65
Total operating expenses														11,468		10,735		9,629
Operating income	386		373		364	[2]	293		525	[3]	335	376	303	1,416	[4]	1,539	[5]	1,235	[6]
Interest expense														(140)		(155)		(124)
Other expense, net														(21)		(384)		(114)
Income from continuing operations before income taxes and equity income														1,255		1,000		997
Income tax expense														(223)		(167)		(161)
Income from continuing operations before equity income														1,032		833		836
Equity in net income of affiliates														31		35		16
Equity in net income (loss) of subsidiaries														0		0		0
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 noncontrolling interest														73		69		85
Net income attributable to Aptiv	$ 256		$ 395		$ 369		$ 335		$ 281		$ 293	$ 258	$ 425	1,355		1,257		1,450
Reportable Legal Entities | Parent
Net sales														0		0		0
Cost of sales														0		0		0
Selling, general and administrative														137		87		32
Amortization														0		0		0
Restructuring														0		0		0
Total operating expenses														137		87		32
Operating income														(137)		(87)		(32)
Interest expense														(255)		(208)		(105)
Other expense, net														0		(5)		(20)
Income from continuing operations before income taxes and equity income														(392)		(300)		(157)
Income tax expense														0		60		0
Income from continuing operations before equity income														(392)		(240)		(157)
Equity in net income of affiliates														0		0		0
Equity in net income (loss) of subsidiaries														1,747		1,497		1,607
Income from continuing operations														1,355		1,257		1,450
Income from discontinued operations, net of tax														0		0		0
Net income														1,355		1,257		1,450
Net income attributable to noncontrolling interest														0		0		0
Net income attributable to Aptiv														1,355		1,257		1,450
Reportable Legal Entities | Subsidiary Guarantors
Net sales														0		0		0
Cost of sales														0		0		0
Selling, general and administrative														0		0		0
Amortization														0		0		0
Restructuring														0		0		0
Total operating expenses														0		0		0
Operating income														0		0		0
Interest expense														(24)		(23)		(30)
Other expense, net														144		(163)		89
Income from continuing operations before income taxes and equity income														120		(186)		59
Income tax expense														0		0		0
Income from continuing operations before equity income														120		(186)		59
Equity in net income of affiliates														0		0		0
Equity in net income (loss) of subsidiaries														1,565		1,621		1,548
Income from continuing operations														1,685		1,435		1,607
Income from discontinued operations, net of tax														0		0		0
Net income														1,685		1,435		1,607
Net income attributable to noncontrolling interest														0		0		0
Net income attributable to Aptiv														1,685		1,435		1,607
Reportable Legal Entities | Subsidiary Issuer/Guarantor
Net sales														0		0		0
Cost of sales														0		0		(6)
Selling, general and administrative														0		0		0
Amortization														0		0		0
Restructuring														0		0		0
Total operating expenses														0		0		(6)
Operating income														0		0		6
Interest expense														(174)		(202)		(180)
Other expense, net														13		(11)		18
Income from continuing operations before income taxes and equity income														(161)		(213)		(156)
Income tax expense														59		78		57
Income from continuing operations before equity income														(102)		(135)		(99)
Equity in net income of affiliates														0		0		0
Equity in net income (loss) of subsidiaries														56		406		508
Income from continuing operations														(46)		271		409
Income from discontinued operations, net of tax														0		0		0
Net income														(46)		271		409
Net income attributable to noncontrolling interest														0		0		0
Net income attributable to Aptiv														(46)		271		409
Reportable Legal Entities | Non-Guarantor Subsidiaries
Net sales														12,884		12,274		10,864
Cost of sales														10,270		9,527		8,697
Selling, general and administrative														815		837		771
Amortization														117		117		70
Restructuring														129		167		65
Total operating expenses														11,331		10,648		9,603
Operating income														1,553		1,626		1,261
Interest expense														(11)		(67)		(87)
Other expense, net														146		140		77
Income from continuing operations before income taxes and equity income														1,688		1,699		1,251
Income tax expense														(282)		(305)		(218)
Income from continuing operations before equity income														1,406		1,394		1,033
Equity in net income of affiliates														31		35		16
Equity in net income (loss) of subsidiaries														0		0		0
Income from continuing operations														1,437		1,429		1,049
Income from discontinued operations, net of tax														365		458		683
Net income														1,802		1,887		1,732
Net income attributable to noncontrolling interest														73		69		85
Net income attributable to Aptiv														1,729		1,818		1,647
Eliminations
Net sales														0		0		0
Cost of sales														0		0		0
Selling, general and administrative														0		0		0
Amortization														0		0		0
Restructuring														0		0		0
Total operating expenses														0		0		0
Operating income														0		0		0
Interest expense														324		345		278
Other expense, net														(324)		(345)		(278)
Income from continuing operations before income taxes and equity income														0		0		0
Income tax expense														0		0		0
Income from continuing operations before equity income														0		0		0
Equity in net income of affiliates														0		0		0
Equity in net income (loss) of subsidiaries														(3,368)		(3,524)		(3,663)
Income from continuing operations														(3,368)		(3,524)		(3,663)
Income from discontinued operations, net of tax														0		0		0
Net income														(3,368)		(3,524)		(3,663)
Net income attributable to noncontrolling interest														0		0		0
Net income attributable to Aptiv														$ (3,368)		$ (3,524)		$ (3,663)

[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.