Consolidated Statements Of Operations (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]              
Net sales $ 3,797       $ 3,897    
Operating expenses:              
Cost of sales 3,056       3,164    
Selling, general and administrative 255       248    
Amortization 24       24    
Restructuring 16       21    
Total operating expenses 3,351       3,457    
Operating income 446       440    
Interest expense (32)       (35)    
Other income (expense), net (54)       (17)    
Income from continuing operations before income taxes and equity income 360       388    
Income tax expense (61)       (69)    
Income from continuing operations before equity income 299       319    
Equity income, net of tax 5       7    
Income from continuing operations 304       326    
Income (loss) from discontinued operations, net of tax (75)       15    
Net income 229       341    
Net income attributable to noncontrolling interest 20       21    
Net income attributable to Delphi 209       320    
Amounts attributable to Delphi:              
Income from continuing operations 288       310    
Income (loss) from discontinued operations (79)       10    
Net income attributable to Delphi $ 209       $ 320    
Basic net income (loss) per share:              
Income from Continuing Operations, per basic share $ 0.99       $ 1.02    
Income (loss) from Discontinued Operations, per basic share $ (0.27)       $ 0.03    
Basic net income per share attributable to Delphi $ 0.72       $ 1.05    
Weighted average number of basic shares outstanding 290.90       305.85    
Diluted net income (loss) per share:              
Income from Continuing Operations, per diluted share $ 0.99       $ 1.01    
Income (loss) from Discontinued Operations, per diluted share $ (0.27)       $ 0.03    
Diluted net income per share attributable to Delphi $ 0.72       $ 1.04    
Weighted average number of diluted shares outstanding 291.81       306.89    
Cash dividends declared per share $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 1.00 $ 0.68