SHAREHOLDERS’ EQUITY AND NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended								12 Months Ended
	Apr. 25, 2019	Apr. 24, 2019	Apr. 26, 2018	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	Jan. 24, 2019
Share Repurchases [Line Items]
Stock Repurchased and Retired During Period, Shares													2,622,776	293,695	0
Numerator:
Net income attributable to Delphi Technologies					$ (40)	$ 14	$ 27	$ 16	$ 135	$ 39	$ 86	$ 98	$ 17	$ 358	$ 285
Denominator:
Weighted average ordinary shares outstanding, basic (in shares)					86,070,000.00	86,900,000	87,770,000	88,450,000	88,490,000	88,740,000	88,780,000	88,710,000	87,290,000	88,680,000	88,610,000
Dilutive shares related to RSUs (in shares)													130,000	210,000	50,000.00
Weighted average ordinary shares outstanding, including dilutive shares (in shares)				88,610,000	86,140,000	86,910,000	88,110,000	88,550,000	88,630,000	88,970,000	89,050,000.00	88,920,000	87,420,000	88,890,000	88,660,000
Net income per share attributable to Delphi Technologies:
Basic (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
Diluted (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
Anti-dilutive securities share impact (in shares)													0	0	0
Stock Repurchased Average Price													$ 17.16	$ 34.05	$ 0
Stock Repurchased and Retired During Period, Value													$ 45	$ 10	$ 0
Share repurchase Program January [Member] [Domain]
Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount																$ 200
Restricted Stock Units (RSUs)
Share Repurchases [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period													1,255,000	591,000	312,000
Employee and Non-employee members | Restricted Stock Units (RSUs)
Share Repurchases [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	70,924	33,944	34,756