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OTHER OPERATING EXPENSE, NET - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Other Income and Expenses [Abstract] |  |
Merger, acquisition and divestiture expense | $ 13 | $ 21

X
- Definition Transaction related expenses including merger, acquisition and divestiture + References No definition available. + Details
Name: | bwa_MergerAcquisitionAndDivestitureExpense
Namespace Prefix: | bwa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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