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2421407 - Disclosure - Retirement Benefit Plans - Assumptions Used (Details)
(http://www.borgwarner.com/role/RetirementBenefitPlansAssumptionsUsedDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000908255 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
U.S. Plans:Non-U.S. Plans:U.S. other postretirement benefit plans [Member]U.S. Plans:Non-U.S. Plans:U.S. other postretirement benefit plans [Member]U.S. Plans:Non-U.S. Plans:U.S. other postretirement benefit plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
 
 
 
 
 
 
 
 
 
Assumptions used calculating benefit obligation, discount rate
3.94%  
2.25%  
3.61%  
4.15%  
2.99%  
3.84%  
   
Assumptions used calculating benefit obligation, rate of compensation increase
 
3.00%  
  
3.01%  
    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
 
 
 
 
 
 
 
 
 
Assumptions used calculating net periodic benefit cost, discount rate
4.15%  
2.99%  
3.84%  
3.89%  
2.84%  
3.50%  
4.41%  
3.90%  
4.00%  
Assumptions used calculating net periodic benefit cost, rate of compensation increase
 
3.01%  
  
2.84%  
  
2.77%  
 
Assumptions used calculating net periodic benefit cost, expected long-term return on assets
6.70%  
6.41%  
 
6.71%  
6.53%  
 
6.75%  
6.24%