Shareholders' Equity And Net Income Per Share Weighted Average Shares Outstanding and Net Income Per Share (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		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Numerator:
Income from continuing operations																	$ 1,021		$ 834		$ 813
Income from discontinued operations																	334		423		637
Net income attributable to Aptiv	$ 256		$ 395		$ 369		$ 335		$ 281		$ 293		$ 258		$ 425		$ 1,355		$ 1,257		$ 1,450
Denominator:
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
Dilutive shares related to RSUs																	870		680		1,440
Weighted average ordinary shares outstanding, including dilutive shares	267,440		267,160		268,030		269,540		271,640		272,770		273,370		277,040		268,030		273,700		286,640
Basic net income per share:
Income from continuing operations, per basic share	$ 0.78	[1]	$ 1.11	[1]	$ 1.11	[1]	$ 0.82	[1]	$ 0.67	[1]	$ 0.72	[1]	$ 0.91	[1]	$ 0.76	[1]	$ 3.82	[1]	$ 3.05	[1]	$ 2.85
Income from discontinued operations, per basic share	0.18	[1]	0.37	[1]	0.27	[1]	0.42	[1]	0.37	[1]	0.36	[1]	0.04	[1]	0.78	[1]	1.25	[1]	1.55	[1]	2.23
Basic net income per share attributable to Aptiv	0.96	[1]	1.48	[1]	1.38	[1]	1.24	[1]	1.04	[1]	1.08	[1]	0.95	[1]	1.54	[1]	5.07	[1]	4.60	[1]	5.08
Diluted net income per share:
Income from continuing operations, per diluted share	0.77	[1]	1.11	[1]	1.11	[1]	0.82	[1]	0.67	[1]	0.72	[1]	0.90	[1]	0.75	[1]	3.81	[1]	3.05	[1]	2.84
Income from discontinued operations, per diluted share	0.18	[1]	0.37	[1]	0.27	[1]	0.42	[1]	0.36	[1]	0.35	[1]	0.04	[1]	0.78	[1]	1.25	[1]	1.54	[1]	2.22
Diluted net income per share attributable to Aptiv	$ 0.95	[1]	$ 1.48	[1]	$ 1.38	[1]	$ 1.24	[1]	$ 1.03	[1]	$ 1.07	[1]	$ 0.94	[1]	$ 1.53	[1]	5.06	[1]	4.59	[1]	5.06
Anti-dilutive securities share impact																	$ 0.00		$ 0.00		$ 0.00

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