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Shareholders' Equity And Net Income Per Share Weighted Average Shares Outstanding and Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Income from continuing operations                 $ 1,067 $ 1,021 $ 834
Income from discontinued operations                 0 334 423
Net income attributable to Aptiv $ 247 $ 222 $ 291 $ 307 $ 256 $ 395 $ 369 $ 335 $ 1,067 $ 1,355 $ 1,257
Denominator:                      
Weighted average number of basic shares outstanding 262,610 264,560 264,810 265,690 265,840 266,240 267,410 269,200 264,410 267,160 273,020
Dilutive shares related to RSUs                 810 870 680
Weighted average ordinary shares outstanding, including dilutive shares 263,650 265,330 265,480 266,440 267,440 267,160 268,030 269,540 265,220 268,030 273,700
Basic net income per share:                      
Income from continuing operations, per basic share $ 0.94 $ 0.84 $ 1.10 $ 1.16 $ 0.78 $ 1.11 $ 1.11 $ 0.82 $ 4.04 $ 3.82 $ 3.05
Income from discontinued operations, per basic share 0.00 0.00 0.00 0.00 0.18 0.37 0.27 0.42 0.00 1.25 1.55
Basic net income per share attributable to Aptiv 0.94 0.84 1.10 1.16 0.96 1.48 1.38 1.24 4.04 5.07 4.60
Diluted net income per share:                      
Income from continuing operations, per diluted share 0.94 0.84 1.10 1.15 0.77 1.11 1.11 0.82 4.02 3.81 3.05
Income from discontinued operations, per diluted share 0.00 0.00 0.00 0.00 0.18 0.37 0.27 0.42 0.00 1.25 1.54
Diluted net income per share attributable to Aptiv $ 0.94 $ 0.84 $ 1.10 $ 1.15 $ 0.95 $ 1.48 $ 1.38 $ 1.24 4.02 5.06 4.59
Anti-dilutive securities share impact                 $ 0.00 $ 0.00 $ 0.00