Changes in Accumulated Other Comprehensive Income (Loss) AOCI Reclassifications (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
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)
Other Income											8		9	(2)
Income tax expense											(223)		(167)	(161)
Income from continuing operations		222		306	306	229	197	202	253	216	1,063		868	852
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
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net income attributable to Aptiv											(31)		(136)	(113)
Amount Reclassified from Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of Sales											0	[2]	(29)	0
Total (loss) income before income taxes											0		(29)	0
Income tax expense											0		0	0
Income from continuing operations											0		(29)	0
Net income attributable to noncontrolling interest											0		0	0
Net income attributable to Aptiv											0		(29)	0
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total (loss) income before income taxes											(7)		(126)	(118)
Income tax expense											6		30	28
Income from continuing operations											(1)		(96)	(90)
Net income attributable to noncontrolling interest											0		0	0
Net income attributable to Aptiv											(1)		(96)	(90)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives | Commodity Derivative
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of Sales											18		(42)	(44)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives | Foreign Currency Derivative
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of Sales											(25)		(84)	74
Amount Reclassified from Accumulated Other Comprehensive Income | Pension and postretirement plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Actuarial gains/(losses)	[3]										(35)		(12)	(18)
Settlement loss	[3]										(1)		0	(11)
Curtailment gain	[3]										0		0	3
Total (loss) income before income taxes											(36)		(12)	(26)
Income tax expense											6		1	3
Income from continuing operations											(30)		(11)	(23)
Net income attributable to noncontrolling interest											0		0	0
Net income attributable to Aptiv											$ (30)		$ (11)	$ (23)

[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] Represents accumulated currency translation adjustment losses reclassified to net income as a result of the sale of the Company's Mechatronics business during the year ended December 31, 2016, as further described in Note 20. Acquisitions and Divestitures.

[3] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 12. Pension Benefits for additional details).