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Commitments And Contingencies Brazil Matters (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Loss Contingency Accrual, Provision $ 0 $ 10 $ 300
Brazil      
Loss Contingencies [Line Items]      
Brazil Loss Contingency, Claims asserted against Delphi 145    
Loss contingency accrual 30    
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 $ 115