Debt Instrument, Redemption Price, Redeemable Principal Amount

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The difference between the fair value of the debt instruments and their carrying value.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Maximum Line Of Credit Potential Additional Increase

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

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-SubTopic 30
-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

+ Details

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- Details

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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=bwa_SeniorNotesDueJuly2027Member
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- Details

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- Details

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- Details

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NOTES PAYABLE AND DEBT - Narrative (Details) - USD ($)	Oct. 05, 2020	Dec. 31, 2020	Oct. 01, 2020	Jun. 19, 2020	Mar. 13, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Short-term, weighted average interest rate on borrowings outstanding		1.70%				2.50%
Debt, weighted average interest rate		2.80%				2.80%
Multi-currency revolving credit agreement, maximum borrowing capacity					$ 1,500,000,000
Maximum line of credit potential additional increase		$ 2,000,000,000.0
Estimated fair value of senior unsecured notes		4,052,000,000				$ 2,025,000,000
Debt, difference between fair value and carrying value		332,000,000				106,000,000
Outstanding letters of credit		33,000,000				28,000,000
Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face value				$ 1,100,000,000
Short-term borrowings
Line of Credit Facility [Line Items]
Short-term borrowings		45,000,000				$ 34,000,000
4.625% Senior notes due 09/15/20 ($250 million par value) \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face value				$ 250,000,000
Debt instrument stated interest rate				4.625%		4.625%
2.650% Senior notes due 07/01/27 ($1,100 million par value) \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument stated interest rate				2.65%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Multi-currency revolving credit agreement, current borrowing capacity					1,200,000,000
Multi-currency revolving credit agreement, maximum borrowing capacity			$ 2,000,000,000.0
Long-term line of credit		0				$ 0
Maximum line of credit potential additional increase					$ 1,000,000,000.0
Commercial Paper
Line of Credit Facility [Line Items]
Multi-currency revolving credit agreement, current borrowing capacity		2,000,000,000.0
Short-term, Unsecured Commercial Paper Notes
Line of Credit Facility [Line Items]
Multi-currency revolving credit agreement, maximum borrowing capacity			$ 2,000,000,000.0
Long-term line of credit		$ 0				$ 0
DT Notes \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face value	$ 800,000,000
Debt instrument stated interest rate	5.00%
Redeemable principal amount	$ 776,000,000
Percentage of principal amount redeemed	97.00%
Senior notes	$ 24,000,000