XML 198 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Research and Development Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Research and Development [Abstract] |  |  |
Gross R&D expenditures | $ 511.7 | $ 473.1 | $ 417.8
Customer reimbursements | (71.6) | (65.6) | (74.6)
Net R&D expenditures | $ 440.1 | $ 407.5 | $ 343.2
Net R&D expenditures as a percentage of net sales | 4.20% | 4.20% | 3.80%
Research and Development Contract, Percent of Net Research and Development, Maximum | 5.00% | 5.00% | 5.00%

X
- Definition Gross Research and Development Expenditures + References No definition available. + Details
Name: | bwa_GrossResearchAndDevelopmentExpenditures
Namespace Prefix: | bwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net Research and Development expenditures as a percentage of net sales. + References No definition available. + Details
Name: | bwa_NetResearchAndDevelopmentExpendituresAsPercentageOfNetSales
Namespace Prefix: | bwa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Research and Development Contract, Percent of Net Research and Development, Maximum + References No definition available. + Details
Name: | bwa_ResearchAndDevelopmentContractPercentOfNetResearchAndDevelopmentMaximum
Namespace Prefix: | bwa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Customer Reimbursements. + References No definition available. + Details
Name: | bwa_ResearchAndDevelopmentCustomerReimbursements
Namespace Prefix: | bwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
Name: | us-gaap_ResearchAndDevelopmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration