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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