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v3.7.0.1

Subsequent Events (Details) $ in Millions | Dec. 31, 2017 USD ($)
--- | ---
Scenario, Forecast [Member] | Sevcon, Inc [Member] |
Subsequent Event [Line Items] |
Business Acquisition, Enterprise Value | $ 200

X
- Definition Business Acquisition, Enterprise Value + References No definition available. + Details
Name: | bwa_BusinessAcquisitionEnterpriseValue
Namespace Prefix: | bwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bwa_SevconIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |