Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax

No definition available.

Name:	bwa_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesBeforeTax
Namespace Prefix:	bwa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	bwa_DerivativesDesignatedAsNetInvestmentHedgesUnderTopic815Abstract
Namespace Prefix:	bwa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

Name:	us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1),(2)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_NetInvestmentHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial Instruments - Income Statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 6.9		$ 1.5
Gain (loss) expected to be reclassified in one year or less	7.2
Foreign currency contracts
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	6.7		1.3
Gain (loss) expected to be reclassified in one year or less	7.2
Foreign currency contracts \| Sales
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net	(0.3)	0.3
Foreign currency contracts \| Cost of goods sold
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net	1.5	(0.8)
Foreign currency contracts \| SG&A expense
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) recognized in net income, ineffective portion and amount excluded from effectiveness testing, net	0.1	0.1
Foreign currency contracts \| SG&A expense
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net		(0.3)
Gain (loss) recognized in net income, ineffective portion and amount excluded from effectiveness testing, net	(0.3)
Foreign currency contracts \| SG&A expense
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) recognized in net income, ineffective portion and amount excluded from effectiveness testing, net
Net investment hedge
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	0.2		0.2
Gain (loss) expected to be reclassified in one year or less	0
Net investment hedge \| Interest expense
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) recognized in net income, ineffective portion and amount excluded from effectiveness testing, net		$ 0.7