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Changes in Accumulated Other Comprehensive Income AOCI Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales $ 2,834 $ 2,498 $ 8,739 $ 7,540
Income tax expense (66) (31) (208) (88)
Net income 231 413 850 1,151
Net income attributable to noncontrolling interest (9) (18) (30) (52)
Net income attributable to Aptiv 222 395 820 1,099
Amount Reclassified from Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income attributable to Aptiv (3) (3) (3) (32)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes (1) 6 5 (18)
Income tax expense 1 0 2 10
Net income 0 6 7 (8)
Net income attributable to noncontrolling interest 0 0 0 0
Net income attributable to Aptiv 0 6 7 (8)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives | Commodity derivatives        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales (1) (5) (16) (8)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivatives | Foreign currency derivatives        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales 2 (1) 11 26
Amount Reclassified from Accumulated Other Comprehensive Income | Pension and postretirement plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial losses [1] (4) (11) (12) (29)
Income before income taxes (4) (11) (12) (29)
Income tax expense 1 2 2 5
Net income (3) (9) (10) (24)
Net income attributable to noncontrolling interest 0 0 0 0
Net income attributable to Aptiv $ (3) $ (9) $ (10) $ (24)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 9. Pension Benefits for additional details).