Discontinued Operations Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended			12 Months Ended
	Dec. 04, 2017	Nov. 22, 2017	Sep. 28, 2017	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 24, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution Date	Dec. 04, 2017
Record Date		Nov. 22, 2017
Dividend from Delphi Technologies Spin-Off							$ 1,148	$ 0	$ 0
Cash transferred from Delphi Technologies related to spin-off							180	0	0
Net proceeds from divestiture of discontinued operations							0	48	713
Gain (loss) on divestiture of discontinued operations, net of tax				$ 104			0	104	318
Post-Closing Adjustments to Prior Period Gain on Divestiture							0	(3)	0
Accounts receivable to be remitted to Delphi Technologies							123	0
Accounts payable to be remitted on behalf of Delphi Technologies							132	0
KDAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
KDAC Ownership Percentage, Classified as Discontinued Operations										50.00%
SDAAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
SDAAC Ownership Percentage, Classified as Discontinued Operations				50.00%
Selling, General and Administrative Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation Costs							118
Thermal Systems | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of discontinued operations									670
Gain (loss) on divestiture of discontinued operations, net of tax									$ 271
Gain (loss) on divestiture of discontinued operations, net of tax, per share									$ 0.95
Tax effect of gain on divestiture of discontinued operations									$ 52
Transaction costs									10
Post-Closing Adjustments									18
Thermal Systems | Discontinued Operations, Disposed of by Sale | KDAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from divestiture of discontinued operations					$ 70
Gain (loss) on divestiture of discontinued operations, net of tax					$ 47				$ (41)
Gain (loss) on divestiture of discontinued operations, net of tax, per share									$ (0.14)
Impairment loss on KDAC interest						$ 88
Impairment of KDAC interest, Per Share				$ 0.30
Fair value of KDAC interest						$ 32
Thermal Systems | Discontinued Operations, Disposed of by Sale | SDAAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from divestiture of discontinued operations								62
Gain (loss) on divestiture of discontinued operations, net of tax								$ 104
Gain (loss) on divestiture of discontinued operations, net of tax, per share								$ 0.38
Tax effect of gain on divestiture of discontinued operations								$ 10
Cash divested							$ 29
Thermal Systems | Discontinued Operations, Disposed of by Sale | Other income (expense), net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition Services Agreement Fees								$ 8	$ 8
Delphi Technologies Debt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term Debt, Gross	$ 1,550
Delphi Technologies Tranche A Term Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans Payable	$ 750
Senior Notes | Delphi Technologies Senior Notes, 5.000% Due 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Face Amount			$ 800
Debt Instrument, Maturity Date			Oct. 01, 2025
Debt Instrument, Interest Rate, Stated Percentage			5.00%