QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended								12 Months Ended
	Dec. 04, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Net sales		$ 1,056	$ 1,033	$ 1,121	$ 1,151	$ 1,171	$ 1,159	$ 1,232	$ 1,296	$ 4,361	$ 4,858	$ 4,849
Cost of sales		907	883	955	983	959	965	991	1,046	3,728	3,961	3,881
Gross Profit		149	150	166	168	212	194	241	250	633	897
Operating income		(15)	45	56	55	93	81	122	138	141	434	446
Net income		(34)	17	31	19	142	43	90	105	33	380	319
Net income attributable to noncontrolling interest		6	3	4	3	7	4	4	7	16	22	34
Net income attributable to Delphi Technologies		$ (40)	$ 14	$ 27	$ 16	$ 135	$ 39	$ 86	$ 98	$ 17	$ 358	$ 285
Basic net income per share attributable to Delphi Technologies (in dollars per share)		$ (0.46)	$ 0.16	$ 0.31	$ 0.18	$ 1.53	$ 0.44	$ 0.97	$ 1.10	$ 0.19	$ 4.04	$ 3.22
Weighted average ordinary shares outstanding, basic (in shares)		86,070	86,900	87,770	88,450	88,490	88,740	88,780	88,710	87,290	88,680	88,610
Diluted net income per share attributable to Delphi Technologies (in dollars per share)		$ (0.46)	$ 0.16	$ 0.31	$ 0.18	$ 1.52	$ 0.44	$ 0.97	$ 1.10	$ 0.19	$ 4.03	$ 3.21
Weighted average number of diluted shares outstanding (in shares)	88,610	86,140	86,910	88,110	88,550	88,630	88,970	89,050	88,920	87,420	88,890	88,660
Restructuring Cost and Reserve [Line Items]
Restructuring (Note 10)										$ 80	$ 35	$ 98