XML 220 R76.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Retirement Benefit Plans - Asset Allocations (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Under Contractual Obligation | $ 4.0 |
Domestic Plan [Member] | Pension Plan [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Domestic Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 11.00% | 11.00%
Domestic Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 56.00% | 53.00%
Domestic Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 33.00% | 36.00%
Foreign Plan [Member] | Pension Plan [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Foreign Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 8.00% | 8.00%
Foreign Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 55.00% | 44.00%
Foreign Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 37.00% | 48.00%
Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 15.0 |
Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% |
Minimum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 25.00% |
Minimum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Minimum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 43.00% |
Minimum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 30.00% |
Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 25.0 |
Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 15.00% |
Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 65.00% |
Maximum [Member] | Domestic Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% |
Maximum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Real estate and other [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |
Maximum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 65.00% |
Maximum [Member] | Foreign Plan [Member] | Pension Plan [Member] | Equity securities [Member] |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 56.00% |

X
- Definition Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Under Contractual Obligation. + References No definition available. + Details
Name: | bwa_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUnderContractualObligation
Namespace Prefix: | bwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAssetsTargetAllocationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_DomesticPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |