Changes in Accumulated Other Comprehensive Income (Loss) AOCI Reclassifications (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of sales		$ 3,543	$ 3,433	$ 13,182	$ 11,126	$ 11,711
Other Income				1	6	20
Income tax expense				(101)	(49)	(132)
Income from continuing operations		39	315
Net income attributable to noncontrolling interest				(19)	(18)	(19)
Net income attributable to Aptiv		$ 31	$ 299	590	1,804	990
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net income attributable to Aptiv				49	(34)	(13)
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				65	(21)	(6)
Income tax expense				0	0	0
Income from continuing operations				65	(21)	(6)
Net income attributable to noncontrolling interest				0	0	0
Net income attributable to Aptiv				65	(21)	(6)
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				68	(7)	(15)
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				(3)	(14)	9
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)	[1]			(15)	(16)	(10)
Curtailment gain	[1]			(5)	0	0
Total (loss) income before income taxes				(20)	(16)	(10)
Income tax expense				4	3	3
Income from continuing operations				(16)	(13)	(7)
Net income attributable to noncontrolling interest				0	0	0
Net income attributable to Aptiv				$ (16)	$ (13)	$ (7)

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