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Stock Incentive Plans - Performance Share Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incremental modification expense   $ 5.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost $ 7.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Performance Share Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awarding of performance shares earned payable in cash   40.00%bwa_AwardingOfPerformanceSharesEarnedPayableInCash
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
 
Awarding of performance shares earned payable in common stock   60.00%bwa_AwardingOfPerformanceSharesEarnedPayableInCommonStock
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
 
Compensation expense recognized in cash by Company over the performance period   40.00%bwa_CompensationExpenseRecognizedInCashByCompanyOverPerformancePeriod
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
 
Compensation expense recognized in common stock by Company over the performance period   60.00%bwa_CompensationExpenseRecognizedInCommonStockByCompanyOverPerformancePeriod
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
 
Performance share plan expense $ 11.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
$ 10.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
$ 35.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
Performance share plan, shares issued in period   545,375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
[1] 1,116,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= bwa_PerformanceSharePlansMember
[1]
[1] Shares were issued in February of the following year.