Commitments And Contingencies Brazil Matters (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision	$ 10	$ 300	$ 0
Loss contingency accrual	0	$ 300
Brazil
Loss Contingencies [Line Items]
Brazil Loss Contingency, Claims asserted against Delphi	185
Loss contingency accrual	25
Minimum | Brazil
Loss Contingencies [Line Items]
Range of Possible Loss, Portion Not Accrued	0
Maximum | Brazil
Loss Contingencies [Line Items]
Range of Possible Loss, Portion Not Accrued	$ 160