Segment Reporting Reconciliation of Sales and Operating Data (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
Segment Reporting Information [Line Items]
Net sales		$ 3,440	$ 3,148	$ 3,153		$ 3,143	$ 3,193		$ 3,039	$ 3,084	$ 2,958	$ 12,884		$ 12,274		$ 10,864
Depreciation and amortization												546		489		344
Adjusted operating income												1,594		1,623		1,360
Operating income		386	$ 373	$ 364	[1]	293	$ 525	[2]	$ 335	$ 376	$ 303	1,416	[3]	1,539	[4]	1,235	[5]
Equity income, net of tax												31		35		16
Net income attributable to noncontrolling interest												42		34		39
Capital expenditures												698		657		503
Gain (loss) on business divestitures														141		(8)
Restructuring						$ 52						129		167		65
Mechatronics Business
Segment Reporting Information [Line Items]
Gain (loss) on business divestitures		$ 141
Signal and Power Solutions
Segment Reporting Information [Line Items]
Restructuring												67		125		39
Advanced Safety and User Experience
Segment Reporting Information [Line Items]
Restructuring												62		42		26
Advanced Safety and User Experience | Mechatronics Business
Segment Reporting Information [Line Items]
Gain (loss) on business divestitures												141
Operating Segments | Signal and Power Solutions
Segment Reporting Information [Line Items]
Net sales												9,507		9,319		8,183
Depreciation and amortization												438		401		276
Adjusted operating income												1,302		1,272		1,013
Operating income												1,206	[3]	1,099	[4]	924	[5]
Equity income, net of tax												31		35		16
Net income attributable to noncontrolling interest												42		34		39
Capital expenditures												477		458		353
Gain (loss) on business divestitures														0		(14)
Restructuring												67		125		39
Operating Segments | Advanced Safety and User Experience
Segment Reporting Information [Line Items]
Net sales												3,446		3,024		2,756
Depreciation and amortization												108		88		68
Adjusted operating income												292		351		347
Operating income												210	[3]	440	[4]	311	[5]
Equity income, net of tax												0		0		0
Net income attributable to noncontrolling interest												0		0		0
Capital expenditures												196		131		102
Gain (loss) on business divestitures														141		6
Restructuring												62		42		26
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	[6]											(69)		(69)		(75)
Depreciation and amortization	[6]											0		0		0
Adjusted operating income	[6]											0		0		0
Operating income	[6]											0	[3]	0	[4]	0	[5]
Equity income, net of tax	[6]											0		0		0
Net income attributable to noncontrolling interest	[6]											0		0		0
Capital expenditures	[6]											25		68		48
Gain (loss) on business divestitures														0		0
Restructuring												$ 0		$ 0		$ 0

[1] 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.

[2] 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.

[3] 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.

[4] 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.

[5] 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.

[6] 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.