v3.26.1
Segment Reporting Reconciliation of Adjusted OI to Net Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 16, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]        
Adjusted operating income   $ 562 $ 572  
Amortization   53 51  
Restructuring   62 37  
Separation costs   (57) (19)  
Other acquisition and portfolio project costs   7 7  
Asset Impairment Charges   7 5  
Compensation expense related to acquisitions   (2) (5)  
Gain (loss) on lease terminations   (4)    
Operating income   378 448  
Interest Expense, Nonoperating   89 93  
Other income, net   (4) 0  
Net gain on equity method transactions $ 13     $ 33
Income before income taxes and equity loss   285 355  
Income Tax Expense (Benefit)   (81) (356)  
Equity loss, net of tax   (13) (10)  
Net income   191 (11)  
Net income attributable to noncontrolling interest   3 1  
Net loss attributable to redeemable noncontrolling interest   (1) (1)  
Net income attributable to Aptiv   189 (11)  
Equity Method Investments   1,418   1,431
Assets   25,203   23,413
Intelligent Systems        
Segment Reporting Information [Line Items]        
Restructuring   12 6  
Engineered Components        
Segment Reporting Information [Line Items]        
Restructuring   4 15  
Electrical Distribution Systems        
Segment Reporting Information [Line Items]        
Restructuring   46 16  
Operating Segments | Intelligent Systems        
Segment Reporting Information [Line Items]        
Adjusted operating income   142 155  
Amortization   22 22  
Restructuring   12 6  
Separation costs   0 0  
Other acquisition and portfolio project costs   3 3  
Asset Impairment Charges   0 0  
Compensation expense related to acquisitions   (2) (5)  
Gain (loss) on lease terminations   0    
Equity loss, net of tax   (17) (15)  
Net loss attributable to redeemable noncontrolling interest   0 0  
Equity Method Investments   1,276   1,288
Assets   9,846   9,213
Operating Segments | Engineered Components        
Segment Reporting Information [Line Items]        
Adjusted operating income   271 274  
Amortization   30 29  
Restructuring   4 15  
Separation costs   0 0  
Other acquisition and portfolio project costs   3 2  
Asset Impairment Charges   0 5  
Compensation expense related to acquisitions   0 0  
Gain (loss) on lease terminations   0    
Equity loss, net of tax   0 0  
Net loss attributable to redeemable noncontrolling interest   (1) (1)  
Equity Method Investments   0   0
Assets   10,376   10,236
Operating Segments | Electrical Distribution Systems        
Segment Reporting Information [Line Items]        
Adjusted operating income   149 143  
Amortization   1 0  
Restructuring   46 16  
Separation costs   (57) (19)  
Other acquisition and portfolio project costs   1 2  
Asset Impairment Charges   7 0  
Compensation expense related to acquisitions   0 0  
Gain (loss) on lease terminations   4    
Equity loss, net of tax   4 5  
Net loss attributable to redeemable noncontrolling interest   0 0  
Equity Method Investments   142   143
Assets   6,108   5,575
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Adjusted operating income   0 0  
Equity loss, net of tax   0 0  
Net loss attributable to redeemable noncontrolling interest   0 $ 0  
Equity Method Investments   0   0
Assets   $ (1,127)   $ (1,611)