BorgWarner (BWA) 10-Q 31 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2019	Oct. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-12162
Entity Registrant Name	BORGWARNER INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3404508
Entity Address, Address Line One	3850 Hamlin Road,
Entity Address, City or Town	Auburn Hills,
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48326
City Area Code	248
Local Phone Number	754-9200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		206,493,057
Entity Central Index Key	0000908255
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.01 per share [Member]
Entity Information [Line Items]
Title of each class	Common Stock, par value $0.01 per share
Trading Symbol	BWA
Security Exchange Name	NYSE
1.80% Senior Notes due 2022 [Member]
Entity Information [Line Items]
Title of each class	1.80% Senior Notes due 2022
Trading Symbol	BWA22
Security Exchange Name	NYSE

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash	$ 916	$ 739
Receivables, net	1,983	1,988
Inventories, net	810	781
Prepayments and other current assets	278	250
Assets held for sale	0	47
Total current assets	3,987	3,805
Property, plant and equipment, net	2,812	2,904
Investments and other long-term receivables	694	592
Goodwill	1,818	1,853
Other intangible assets, net	404	439
Other non-current assets	484	502
Total assets	10,199	10,095
LIABILITIES AND EQUITY
Notes payable and other short-term debt	419	173
Accounts payable and accrued expenses	2,048	2,144
Income taxes payable	58	59
Liabilities held for sale	0	23
Total current liabilities	2,525	2,399
Long-term debt	1,656	1,941
Other non-current liabilities:
Asbestos-related liability	723	755
Retirement-related liabilities	273	298
Other	444	357
Total other non-current liabilities	1,440	1,410
Common stock	3	3
Capital in excess of par value	1,129	1,146
Retained earnings	5,757	5,336
Accumulated other comprehensive loss	(779)	(674)
Common stock held in treasury	(1,653)	(1,585)
Total BorgWarner Inc. stockholders’ equity	4,457	4,226
Noncontrolling interest	121	119
Total equity	4,578	4,345
Total liabilities and equity	$ 10,199	$ 10,095

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 2,492	$ 2,478	$ 7,609	$ 7,956
Cost of sales	1,968	1,963	6,053	6,270
Gross profit	524	515	1,556	1,686
Selling, general and administrative expenses	230	230	668	720
Other expense, net	18	7	63	42
Operating income	276	278	825	924
Equity in affiliates’ earnings, net of tax	(7)	(15)	(25)	(38)
Interest income	(4)	(1)	(9)	(4)
Interest expense	15	14	43	45
Other postretirement (income) expense	(1)	(3)	26	(8)
Earnings before income taxes and noncontrolling interest	273	283	790	929
Provision for income taxes	66	67	230	192
Net earnings	207	216	560	737
Net earnings attributable to the noncontrolling interest, net of tax	13	12	34	36
Net earnings attributable to BorgWarner Inc.	$ 194	$ 204	$ 526	$ 701
Earnings per share — basic	$ 0.94	$ 0.98	$ 2.56	$ 3.36
Earnings per share — diluted	$ 0.94	$ 0.98	$ 2.54	$ 3.34
Weighted Average Number of Shares Outstanding [Abstract]
Basic	205.3	207.5	205.9	208.5
Diluted	206.3	208.7	206.8	209.8

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 194	$ 204	$ 526	$ 701
Other comprehensive (loss) income
Foreign currency translation adjustments	[1]	(114)	(43)	(136)	(124)
Hedge instruments	[1]	1	2	0	0
Defined benefit retirement plans	[1]	4	0	31	5
Total other comprehensive loss attributable to BorgWarner Inc.		(109)	(41)	(105)	(119)
Comprehensive income attributable to BorgWarner Inc.	[1]	85	163	421	582
Net earnings attributable to the noncontrolling interest, net of tax		13	12	34	36
Other comprehensive loss attributable to the noncontrolling interest	[1]	(5)	(3)	(7)	(7)
Comprehensive income		$ 93	$ 172	$ 448	$ 611
[1]	Net of income taxes.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING
Net earnings	$ 560	$ 737
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	324	326
Stock-based compensation expense	30	38
Restructuring expense, net of cash paid	14	35
Pension settlement loss	26	0
Deferred income tax provision (benefit)	28	(37)
Tax Reform Adjustments to Provision for Income Taxes	16	0
Equity in affiliates’ earnings, net of dividends received, and other	9	(22)
Net earnings adjusted for non-cash charges to operations	1,007	1,077
Changes in assets and liabilities:
Receivables	(76)	(111)
Inventories	(56)	(80)
Prepayments and other current assets	(24)	(43)
Accounts payable and accrued expenses	(18)	(201)
Prepaid taxes and income taxes payable	15	(54)
Other assets and liabilities	(24)	(32)
Net cash provided by operating activities	824	556
INVESTING
Capital expenditures, including tooling outlays	(346)	(394)
Payments for business acquired	(10)	0
Proceeds from sale of business, net of cash divested	24	0
Payments for investments in equity securities	(52)	(4)
Proceeds from asset disposals and other	4	5
Net cash used in investing activities	(380)	(393)
FINANCING
Net decrease in notes payable	0	(30)
Additions to long-term debt, net of debt issuance costs	45	20
Repayments of long-term debt, including current portion	(54)	(15)
Payments for purchase of treasury stock	(100)	(150)
Payments for stock-based compensation items	(15)	(15)
Contributions from noncontrolling interest stockholders	4	0
Dividends paid to BorgWarner stockholders	(105)	(106)
Dividends paid to noncontrolling stockholders	(23)	(27)
Net cash used in financing activities	(248)	(323)
Effect of exchange rate changes on cash	(19)	(23)
Net increase (decrease) in cash	177	(183)
Cash and restricted cash at beginning of year	739	545
Cash and restricted cash at end of period	916	362
Cash paid during the period for:
Interest	58	67
Income taxes, net of refunds	$ 148	$ 267

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of BorgWarner Inc. and Consolidated Subsidiaries (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes necessary for a comprehensive presentation of financial position, results of operations and cash flow activity required by GAAP for complete financial statements. In the opinion of management, all normal recurring adjustments necessary for a fair statement of results have been included. Operating results for the three and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. The balance sheet as of December 31, 2018 was derived from the audited financial statements as of that date. For further information, refer to the Consolidated Financial Statements and Footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2018.

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, "Leases (Topic 842)." Under this guidance, a lease is a contract, or part of a contract, that conveys the right to control the use of an identified asset for a period of time in exchange for consideration. Lessees are required to recognize a right-of-use asset and a lease liability for leases with a term of more than 12 months, including operating leases defined under previous GAAP. This guidance was effective for interim and annual reporting periods beginning after December 15, 2018. The Company adopted Accounting Standards Codification ("ASC") 842 as of January 1, 2019, using the optional transition method provided in ASU No. 2018-11, " Leases (Topic 842): Targeted Improvements ." Under this method, the Company recorded an adjustment as of the effective date and did not include any retrospective adjustments to comparative periods to reflect the adoption of ASC 842. In addition, the Company elected the package of practical expedients permitted under the transition guidance within ASC 842, which among other things, does not require the Company to reassess whether existing contracts contain leases, classification of leases identified, nor classification and treatment of initial direct costs capitalized under ASC 840. The Company also elected the practical expedients to combine the lease and non-lease components. The Company did not elect the practical expedient to apply hindsight as part of the leases evaluation. Additionally, the Company elected the practical expedient under ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842", which allows an entity to not reassess whether any existing land easements are or contain leases. The majority of the Company’s global lease portfolio represents leases of real estate, such as manufacturing facilities, warehouses, and office buildings, while the remainder represents leases of personal property, such as vehicle leases, manufacturing and IT equipment. The Company determines whether a contract is or contains a lease at contract inception. The majority of the Company's lease arrangements are comprised of fixed payments and a limited number of these arrangements include a variable payment component based on certain index fluctuations. Adoption of ASC 842 resulted in the recording of lease right-of-use assets ("lease assets") and lease liabilities of approximately $104 million and $103 million , respectively, as of January 1, 2019. The adoption did not impact consolidated net earnings and had no impact on cash flows. The changes made to our Consolidated Balance Sheet as of January 1, 2019 for the adoption of ASC 842 were as follows: (in millions) Balance at December 31, 2018 Adjustments due to ASC 842 Balance at January 1, 2019 Other non-current assets $ 502 $ 104 $ 606 Accounts payable and accrued expenses $ 2,144 $ 23 $ 2,167 Other non-current liabilities $ 357 $ 80 $ 437 In February 2018, the FASB issued ASU No. 2018-07, "Compensation - Stock Compensation (Topic 718)." It expands the scope of the employee share-based payments guidance, which currently only includes share-based payments issued to employees, to also include share-based payments issued to nonemployees for goods and services. This guidance is effective for interim and annual periods beginning after December 15, 2018. The Company adopted this guidance as of January 1, 2019, and there was no impact to the consolidated financial statements. Accounting Standards Not Yet Adopted In August 2018, the FASB issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)." It requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement, if those costs would be capitalized by the customer in a software licensing arrangement under the internal-use software guidance (Subtopic 350-40). This guidance is effective for interim and annual periods beginning after December 15, 2019, and early adoption is permitted. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In August 2018, the FASB issued Accounting Standards Update ("ASU") No. 2018-14, "Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20)." The new standard (i) requires the removal of disclosures that are no longer considered cost beneficial; (ii) clarifies specific requirements of certain disclosures; and (iii) adds new disclosure requirements, including the weighted average interest crediting rates for cash balance plans and other plans with promised interest crediting rates, and reasons for significant gains and losses related to changes in the benefit obligation. This guidance is effective for annual periods beginning after December 15, 2020, and early adoption is permitted. The Company does not expect this guidance to have a material impact on its consolidated financial statements and will include enhanced disclosures in the consolidated financial statements upon adoption. In August 2018, the FASB issued ASU No. 2018-13, "Fair Value Measurement (Topic 820) ." It removes disclosure requirements on fair value measurements including the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. It also amends and clarifies certain disclosures and adds new disclosure requirements including the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements, and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. This guidance is effective for interim and annual periods beginning after December 15, 2019. An entity is permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until the effective date. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments - Credit Losses (Topic 326)." It replaces the current incurred loss impairment method with a new method that reflects expected credit losses. Under this new model an entity would recognize an impairment allowance equal to its current estimate of credit losses on financial assets measured at amortized cost. This guidance is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Revenue from Contracts with Customers The Company manufactures and sells products, primarily to OEMs of light vehicles and, to a lesser extent, to other OEMs of commercial vehicles, off-highway vehicles, certain tier one vehicle systems suppliers and into the aftermarket. Although the Company may enter into long-term supply arrangements with its major customers, the prices and volumes are not fixed over the life of the arrangements, and a contract does not exist for purposes of applying ASC 606, " Revenue from Contracts with Customers" , until volumes are contractually known. Revenue is recognized when performance obligations under the terms of a contract are satisfied, which generally occurs with the transfer of control of the Company's products. For most of the Company's products, transfer of control occurs upon shipment or delivery; however, a limited number of the Company's customer arrangements for highly customized products with no alternative use provide the Company with the right to payment during the production process. As a result, for these limited arrangements, revenue is recognized as goods are produced and control transfers to the customer using the input cost-to-cost method. The Company recorded a contract asset of $10 million and $11 million at September 30, 2019 and December 31, 2018, respectively, for these arrangements. These amounts are reflected in Prepayments and other current assets in the Condensed Consolidated Balance Sheet. Revenue is measured at the amount of consideration the Company expects to receive in exchange for transferring the goods. The Company has a limited number of arrangements with customers where the price paid by the customer is dependent on the volume of product purchased over the term of the arrangement. In other limited arrangements, the Company will provide a rebate to customers based on the volume of products purchased during the course of the arrangement. The Company estimates the volumes to be sold over the term of the arrangement and recognizes revenue based on the estimated amount of consideration to be received from these arrangements. As a result of these arrangements, the Company recognized a liability of $2 million and $6 million at September 30, 2019 and December 31, 2018. These amounts are reflected in Accounts payable and accrued expenses in the Condensed Consolidated Balance Sheet. The Company’s payment terms with customers are customary and vary by customer and geography but typically range from 30 to 90 days . The Company has evaluated the terms of its arrangements and determined that they do not contain significant financing components. The Company provides warranties on some of its products. Provisions for estimated expenses related to product warranty are made at the time products are sold. Refer to Note 9, "Product Warranty," to the Condensed Consolidated Financial Statements for more information. Shipping and handling fees billed to customers are included in sales, while costs of shipping and handling are included in cost of sales. The Company has elected to apply the accounting policy election available under ASC 606 and accounts for shipping and handling activities as a fulfillment cost. In limited instances, certain customers have provided payments in advance of receiving related products, typically at the onset of an arrangement prior to the beginning of production. These contract liabilities are reflected as Accounts payable and accrued expenses and Other non-current liabilities in the Condensed Consolidated Balance Sheet and were $12 million and $14 million at September 30, 2019 and $13 million and $17 million at December 31, 2018, respectively. These amounts are reflected as revenue over the term of the arrangement (typically 3 to 7 years) as the underlying products are shipped. The Company continually seeks business development opportunities and at times provides customer incentives for new program awards. The Company evaluates the underlying economics of each amount of consideration payable to a customer to determine the proper accounting by understanding the reasons for the payment, the rights and obligations resulting from the payment, the nature of the promise in the contract, and other relevant facts and circumstances. When the Company determines that the payments are incremental and incurred only if the new business is obtained and expects to recover these amounts from the customer over the term of the new business arrangement, the Company capitalizes these amounts. The Company recognizes a reduction to revenue, when the products that the upfront payments are related to, are transferred to the customer based on the total amount of products expected to be sold over the term of the arrangement (generally 3 to 7 years). The Company evaluates the amounts capitalized each period end for recoverability and expenses any amounts that are no longer expected to be recovered over the term of the business arrangement. The Company had $36 million and $29 million recorded in Prepayments and other current assets in the Condensed Consolidated Balance Sheet at September 30, 2019 and December 31, 2018, respectively. The Company had $178 million and $187 million recorded in Other non-current assets in the Condensed Consolidated Balance Sheet at September 30, 2019 and December 31, 2018, respectively. The Company's business is comprised of two reporting segments: Engine and Drivetrain. Refer to Note 21, "Reporting Segments," to the Condensed Consolidated Financial Statements for more information. The following table represents a disaggregation of revenue from contracts with customers by segment and region: Three Months Ended September 30, 2019 Three Months Ended September 30, 2018 (In millions) Engine Drivetrain Total Engine Drivetrain Total North America $ 397 $ 456 $ 853 $ 392 $ 452 $ 844 Europe 716 203 919 690 209 899 Asia 357 324 681 386 308 694 Other 30 9 39 33 8 41 Total $ 1,500 $ 992 $ 2,492 $ 1,501 $ 977 $ 2,478 Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 (In millions) Engine Drivetrain Total Engine Drivetrain Total North America $ 1,216 $ 1,362 $ 2,578 $ 1,186 $ 1,341 $ 2,527 Europe 2,277 641 2,918 2,343 748 3,091 Asia 1,053 944 1,997 1,238 982 2,220 Other 91 25 116 95 23 118 Total $ 4,637 $ 2,972 $ 7,609 $ 4,862 $ 3,094 $ 7,956

Research and Development Expend

Research and Development Expenditures	9 Months Ended
	Sep. 30, 2019
Research and Development [Abstract]
Research and Development Expenditures	Research and Development Expenditures The Company's net Research & Development ("R&D") expenditures are included in selling, general and administrative expenses of the Condensed Consolidated Statements of Operations. Customer reimbursements are netted against gross R&D expenditures as they are considered a recovery of cost. Customer reimbursements for prototypes are recorded net of prototype costs based on customer contracts, typically either when the prototype is shipped or when it is accepted by the customer. Customer reimbursements for engineering services are recorded when performance obligations are satisfied in accordance with the contract. Financial risks and rewards transfer upon shipment, acceptance of a prototype component by the customer or upon completion of the performance obligation, as stated in the respective customer agreement. The following table presents the Company’s gross and net expenditures on R&D activities: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Gross R&D expenditures $ 123 $ 122 $ 372 $ 386 Customer reimbursements (21 ) (14 ) (53 ) (49 ) Net R&D expenditures $ 102 $ 108 $ 319 $ 337 The Company has contracts with several customers at the Company's various R&D locations. None of the Company's R&D-related customer reimbursements under these contracts exceeded 5% of net R&D expenditures in any of the periods presented.

Other Expense, Net

Other Expense, Net	9 Months Ended
	Sep. 30, 2019
Other Income and Expenses [Abstract]
Other Expense, net	Other Expense, net Items included in other expense, net consist of: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Restructuring expense $ 14 $ 5 $ 41 $ 44 Merger, acquisition and divestiture expense 4 2 10 5 Other expense (income) — — 12 (7 ) Other expense, net $ 18 $ 7 $ 63 $ 42 During the three and nine months ended September 30, 2019, the Company recorded restructuring expense of $14 million and $41 million , respectively. During the three and nine months ended September 30, 2018, the Company recorded restructuring expense of $5 million and $44 million , respectively. This restructuring expense primarily relates to Drivetrain and Engine segment actions designed to improve future profitability and competitiveness. Refer to Note 19, "Restructuring," to the Condensed Consolidated Financial Statements for more information. During the three and nine months ended September 30, 2019, the Company recorded expenses, primarily professional fees, related to the Company's review of strategic acquisition and divestiture targets, including the 20% equity interest in Romeo Power Technology and the divestiture activities for the non-core pipe and thermostat product lines, of $4 million and $10 million , respectively. During the three and nine months ended September 30, 2018, the Company recorded expenses of $2 million and $5 million , respectively, primarily related to professional fees associated with divestiture activities for the non-core pipe and thermostat product lines. Refer to Note 23, "Assets and Liabilities Held For Sale," to the Condensed Consolidated Financial Statements for more information. During the first nine months of 2019, the Company recorded $14 million of expense related to the receipt of a final unfavorable arbitration decision associated with the resolution of a matter related to a previous acquisition. During the first nine months of 2018, the Company recorded a gain of approximately $4 million related to the settlement of a commercial contract for an entity acquired in the 2015 Remy acquisition.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's provision for income taxes is based upon an estimated annual tax rate for the year applied to federal, state and foreign income. On a quarterly basis, the annual effective tax rate is adjusted, as appropriate, based upon changed facts and circumstances, if any, as compared to those forecasted at the beginning of the fiscal year and each interim period thereafter. The Company's effective tax rate for the nine months ended September 30, 2019 was 29.2% . This rate includes reductions of income tax expense of $11 million related to restructuring expense, $6 million related to other postretirement expense, and $13 million related to other one-time adjustments. This rate also includes an increase in income tax expense of $22 million due to the U.S. Department of the Treasury's issuance of the final regulations in the first quarter of 2019 related to the calculation of the one-time transition tax. The Company's effective tax rate for the nine months ended September 30, 2018 was 20.7% . This rate includes income tax expense of $1 million related to a commercial settlement gain, and reductions of income tax expense of $10 million related to restructuring expense, $20 million related to adjustments to measurement period provisional estimates associated with the Tax Cuts and Jobs Act of 2017, $22 million related to an increase to our deferred tax asset due to the Company's ability to record a tax benefit for certain foreign tax credits now available due to actions the Company took during the year, and $11 million for other one-time tax adjustments, primarily due to changes in tax filing positions. The annual effective tax rates differ from the U.S. statutory rate primarily due to foreign rates which differ from those in the U.S., U.S. taxes on foreign earnings, the realization of certain business tax credits, including foreign tax credits, and favorable permanent differences between book and tax treatment for certain items, including equity in affiliates' earnings.

Inventories, net

Inventories, net	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net Certain U.S. inventories are measured by the last-in, first-out (“LIFO”) method at the lower of cost or market, while other U.S. and foreign operations use the first-in, first-out (“FIFO”) or average-cost methods at the lower of cost and net realizable value. Inventories consisted of the following: September 30, December 31, (in millions) 2019 2018 Raw material and supplies $ 515 $ 485 Work in progress 114 114 Finished goods 195 199 FIFO inventories 824 798 LIFO reserve (14 ) (17 ) Inventories, net $ 810 $ 781

Property, Plant and Equipment,

Property, Plant and Equipment, net	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	Property, Plant and Equipment, net September 30, December 31, (in millions) 2019 2018 Land, land use rights and buildings $ 843 $ 871 Machinery and equipment 2,894 2,851 Finance lease assets 2 2 Construction in progress 326 426 Total property, plant and equipment, gross 4,065 4,150 Less: accumulated depreciation (1,480 ) (1,473 ) Property, plant and equipment, net, excluding tooling 2,585 2,677 Tooling, net of amortization 227 227 Property, plant and equipment, net $ 2,812 $ 2,904 As of September 30, 2019 and December 31, 2018, accounts payable of $60 million and $104 million , respectively, were related to property, plant and equipment purchases. Interest costs capitalized for the nine months ended September 30, 2019 and 2018 were $13 million and $17 million , respectively.

Product Warranty

Product Warranty	9 Months Ended
	Sep. 30, 2019
Product Warranties Disclosures [Abstract]
Product Warranty	Product Warranty The Company provides warranties on some, but not all, of its products. The warranty terms are typically from one to three years. Provisions for estimated expenses related to product warranty are made at the time products are sold. These estimates are established using historical information about the nature, frequency and average cost of warranty claim settlements as well as product manufacturing and industry developments and recoveries from third parties. Management actively studies trends of warranty claims and takes action to improve product quality and minimize warranty claims. Management believes that the warranty accrual is appropriate; however, actual claims incurred could differ from the original estimates, requiring adjustments to the accrual. The following table summarizes the activity in the product warranty accrual accounts: (in millions) 2019 2018 Beginning balance, January 1 $ 103 $ 112 Provisions for current period sales 36 38 Adjustments of prior estimates 9 9 Payments (43 ) (45 ) Translation adjustment and other (4 ) (4 ) Ending balance, September 30 $ 101 $ 110 The product warranty liability is classified in the Condensed Consolidated Balance Sheets as follows: September 30, December 31, (in millions) 2019 2018 Accounts payable and accrued expenses $ 54 $ 56 Other non-current liabilities 47 47 Total product warranty liability $ 101 $ 103

Notes Payable and Long-Term Deb

Notes Payable and Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Notes Payable and Long-Term Debt	Notes Payable and Long-Term Debt As of September 30, 2019 and December 31, 2018, the Company had short-term and long-term debt outstanding as follows: September 30, December 31, (in millions) 2019 2018 Short-term debt Short-term borrowings $ 33 $ 33 Long-term debt 8.00% Senior notes due 10/01/19 ($134 million par value) 134 135 4.625% Senior notes due 09/15/20 ($250 million par value) 251 251 1.80% Senior notes due 11/7/22 (€500 million par value) 542 570 3.375% Senior notes due 03/15/25 ($500 million par value) 497 497 7.125% Senior notes due 02/15/29 ($121 million par value) 119 119 4.375% Senior notes due 03/15/45 ($500 million par value) 494 494 Term loan facilities and other 5 15 Total long-term debt 2,042 2,081 Less: current portion 386 140 Long-term debt, net of current portion $ 1,656 $ 1,941 In July 2016, the Company terminated interest rate swaps which had the effect of converting $384 million of fixed rate notes to variable rates. The gain on the termination was recorded as an increase to the notes and is being amortized as a reduction to interest expense over the remaining terms of the notes. The unamortized gain related to these swap terminations was $1 million and $2 million as of September 30, 2019 and December 31, 2018, respectively, on the 4.625% notes. The Company may utilize uncommitted lines of credit for short-term working capital requirements. As of September 30, 2019 and December 31, 2018, the Company had $33 million in borrowings under these facilities, which are classified as notes payable and short-term debt on the Condensed Consolidated Balance Sheet. The weighted average interest rate on short-term borrowings outstanding as of September 30, 2019 and December 31, 2018 was 3.3% and 4.3% , respectively. The weighted average interest rate on all borrowings outstanding, including the effects of outstanding swaps, as of September 30, 2019 and December 31, 2018 was 3.4% . The Company has a $1.2 billion multi-currency revolving credit facility, which includes a feature that allows the Company's facility to be increased to $1.5 billion with bank group approval. The facility provides for borrowings through June 29, 2022 . The Company has one key financial covenant as part of the credit agreement which is a debt to Earnings Before Interest, Taxes, Depreciation and Amortization ("EBITDA ") ratio. The Company was in compliance with the financial covenant at September 30, 2019. At September 30, 2019 and December 31, 2018, the Company had no outstanding borrowings under this facility. The Company's commercial paper program allows the Company to issue short-term, unsecured commercial paper notes up to a maximum aggregate principal amount outstanding of $1.2 billion . Under this program, the Company may issue notes from time to time and use the proceeds for general corporate purposes. The Company had no outstanding borrowings under this program as of September 30, 2019 and December 31, 2018. The total current combined borrowing capacity under the multi-currency revolving credit facility and commercial paper program cannot exceed $1.2 billion . As of September 30, 2019 and December 31, 2018, the estimated fair values of the Company’s senior unsecured notes totaled $2,141 million and $2,058 million , respectively. The estimated fair values were $104 million more than their carrying value at September 30, 2019 and $8 million less than their carrying value at December 31, 2018. Fair market values of the senior unsecured notes are developed using observable values for similar debt instruments, which are considered Level 2 inputs as defined by ASC 820. The carrying values of the Company's multi-currency revolving credit facility and commercial paper program approximates fair value. The fair value estimates do not necessarily reflect the values the Company could realize in the current markets. The Company had outstanding letters of credit of $28 million and $43 million at September 30, 2019 and December 31, 2018, respectively. The letters of credit typically act as guarantees of payment to certain third parties in accordance with specified terms and conditions.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements ASC 820 emphasizes that fair value is a market-based measurement, not an entity specific measurement. Therefore, a fair value measurement should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering market participant assumptions in fair value measurements, ASC 820 establishes a fair value hierarchy, which prioritizes the inputs used in measuring fair values as follows: Level 1: Observable inputs such as quoted prices for identical assets or liabilities in active markets; Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. Assets and liabilities measured at fair value are based on one or more of the following three valuation techniques noted in ASC 820: A. Market approach: Prices and other relevant information generated by market transactions involving identical or comparable assets, liabilities or a group of assets or liabilities, such as a business. B. Cost approach: Amount that would be required to replace the service capacity of an asset (replacement cost). C. Income approach: Techniques to convert future amounts to a single present amount based upon market expectations (including present value techniques, option-pricing and excess earnings models). The following tables classify assets and liabilities measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018: Basis of fair value measurements (in millions) Balance at Quoted prices in active markets for identical items (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Valuation technique Assets: Foreign currency contracts $ 2 $ — $ 2 $ — A Other long-term receivables (insurance settlement agreement note receivable) $ 35 $ — $ 35 $ — C Net investment hedge contracts $ 28 $ — $ 28 $ — A Liabilities: Foreign currency contracts $ 3 $ — $ 3 $ — A Basis of fair value measurements (in millions) Balance at December 31, 2018 Quoted prices in active markets for identical items (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Valuation technique Assets: Foreign currency contracts $ 3 $ — $ 3 $ — A Other long-term receivables (insurance settlement agreement note receivable) $ 34 $ — $ 34 $ — C Net investment hedge contracts $ 12 $ — $ 12 $ — A Liabilities: Foreign currency contracts $ 2 $ — $ 2 $ — A

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments The Company’s financial instruments include cash and marketable securities. Due to the short-term nature of these instruments, their book value approximates their fair value. The Company’s financial instruments may include long-term debt, interest rate and cross-currency swaps, commodity derivative contracts and foreign currency derivative contracts. All derivative contracts are placed with counterparties that have an S&P, or equivalent, investment grade credit rating at the time of the contracts’ placement. At September 30, 2019 and December 31, 2018, the Company had no derivative contracts that contained credit risk related contingent features. The Company uses certain commodity derivative contracts to protect against commodity price changes related to forecasted raw material and component purchases. The Company primarily utilizes forward and option contracts, which are designated as cash flow hedges. At September 30, 2019 and December 31, 2018, the following commodity derivative contracts were outstanding: Commodity derivative contracts Commodity Volume hedged September 30, 2019 Volume hedged December 31, 2018 Units of measure Duration Copper 261 257 Metric Tons Dec - 20 The Company manages its interest rate risk by balancing its exposure to fixed and variable rates while attempting to optimize its interest costs. The Company selectively uses interest rate swaps to reduce market value risk associated with changes in interest rates (fair value hedges). At September 30, 2019 and December 31, 2018, the Company had no outstanding interest rate swaps. The Company uses foreign currency forward and option contracts to protect against exchange rate movements for forecasted cash flows, including capital expenditures, purchases, operating expenses or sales transactions designated in currencies other than the functional currency of the operating unit. In addition, the Company uses foreign currency forward contracts to hedge exposure associated with our net investment in certain foreign operations (net investment hedges). The Company has also designated its Euro denominated debt as a net investment hedge of the Company's investment in a European subsidiary. Foreign currency derivative contracts require the Company, at a future date, to either buy or sell foreign currency in exchange for the operating units’ local currency. At September 30, 2019 and December 31, 2018, the following foreign currency derivative contracts were outstanding: Foreign currency derivatives (in millions) Functional currency Traded currency Notional in traded currency Notional in traded currency December 31, 2018 Ending Duration Brazilian real Euro 2 4 Jan - 20 Brazilian real US dollar 2 5 Dec - 19 British pound Euro 17 — Mar - 20 British pound US dollar 6 — Mar - 20 Chinese renminbi US dollar 10 — Dec - 19 Euro British pound 1 7 Dec - 19 Euro Chinese renminbi 11 — Dec - 19 Euro Japanese yen 131 — Dec - 19 Euro Polish zloty 7 — Dec - 19 Euro Swedish krona 540 540 Jun - 20 Euro US dollar 9 19 Dec - 20 Japanese yen Chinese renminbi 23 89 Dec - 19 Japanese yen Korean won 1,359 5,785 Dec - 19 Japanese yen US dollar 1 3 Dec - 19 Korean won Euro 2 6 Dec - 19 Korean won Japanese yen 54 266 Dec - 19 Korean won US dollar 7 7 Dec - 19 Swedish krona Euro 17 56 Jan - 20 US dollar Euro 14 — Jan - 20 US dollar Japanese yen 1,900 — Dec - 19 US dollar Korean won 36,721 — Dec - 19 US dollar Mexican peso 153 575 Dec - 19 The Company selectively uses cross-currency swaps to hedge the foreign currency exposure associated with our net investment in certain foreign operations (net investment hedges). At September 30, 2019 and December 31, 2018, the following cross-currency swap contracts were outstanding: Cross-Currency Swaps (in millions) Notional in USD Notional in Local Currency Duration Fixed $ to fixed € $ 250 € 206 Sep - 20 Fixed $ to fixed ¥ $ 100 ¥ 10,978 Feb - 23 At September 30, 2019 and December 31, 2018, the following amounts were recorded in the Condensed Consolidated Balance Sheets as being payable to or receivable from counterparties under ASC 815: (in millions) Assets Liabilities Derivatives designated as hedging instruments Under 815: Location September 30, 2019 December 31, 2018 Location September 30, 2019 December 31, 2018 Foreign currency Prepayments and other current assets $ 2 $ 2 Accounts payable and accrued expenses $ 3 $ 2 Net investment hedges Prepayments and other current assets $ 26 $ — Accounts payable and accrued expenses $ — $ — Other non-current assets $ 2 $ 12 Other non-current liabilities $ — $ — Derivatives not designated as hedging instruments Foreign currency Prepayments and other current assets $ — $ 1 Accounts payable and accrued expenses $ — $ — Effectiveness for cash flow hedges is assessed at the inception of the hedging relationship and quarterly, thereafter. Gains and losses arising from these contracts that are included in the assessment of effectiveness are deferred into accumulated other comprehensive income (loss) ("AOCI") and reclassified into income as the underlying operating transactions are recognized. These realized gains or losses offset the hedged transaction and are recorded on the same line in the statement of operations. The initial value of any component excluded from the assessment of effectiveness will be recognized in income using a systematic and rational method over the life of the hedging instrument. Any difference between the change in fair value of the excluded component and amounts recognized in income under that systematic and rational method will be recognized in AOCI. Effectiveness for net investment hedges is assessed at the inception of the hedging relationship and quarterly, thereafter. Gains and losses arising from these contracts that are included in the assessment of effectiveness are deferred into foreign currency translation adjustments and only released when the subsidiary being hedged is sold or substantially liquidated. The initial value of any component excluded from the assessment of effectiveness will be recognized in income using a systematic and rational method over the life of the hedging instrument. Any difference between the change in fair value of the excluded component and amounts recognized in income under that systematic and rational method will be recognized in AOCI. The table below shows deferred gains (losses) reported in AOCI as well as the amount expected to be reclassified to income in one year or less. The amount expected to be reclassified to income in one year or less assumes no change in the current relationship of the hedged item at September 30, 2019 market rates. (in millions) Deferred gain (loss) in AOCI at Gain (loss) expected to be reclassified to income in one year or less Contract Type September 30, 2019 December 31, 2018 Net investment hedges: Foreign currency $ 6 $ 4 $ — Cross-currency swaps 28 12 — Foreign currency denominated debt (2 ) (30 ) — Total $ 32 $ (14 ) $ — Derivative instruments designated as cash flow hedge instruments as defined by ASC 815 held during the period resulted in the following gains and losses recorded in income: Three Months Ended September 30, 2019 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 2,492 $ 1,968 $ 230 $ (109 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ — Gain (loss) reclassified from AOCI to income $ (2 ) $ — $ 1 Nine Months Ended September 30, 2019 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 7,609 $ 6,053 $ 668 $ (105 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ (1 ) Gain (loss) reclassified from AOCI to income $ (4 ) $ 1 $ 2 Three Months Ended September 30, 2018 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 2,478 $ 1,963 $ 230 $ (41 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ 2 Gain (loss) reclassified from AOCI to income $ (1 ) $ — $ — Nine Months Ended September 30, 2018 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 7,956 $ 6,270 $ 720 $ (119 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ (4 ) Gain (loss) reclassified from AOCI to income $ (2 ) $ (3 ) $ — There were no gains or losses recorded in income related to components excluded from the assessment of effectiveness for derivative instruments designated as cash flow hedges. Gains and (losses) on derivative instruments designated as net investment hedges were recognized in other comprehensive income during the periods presented below. (in millions) Three Months Ended September 30, Nine Months Ended September 30, Net investment hedges 2019 2018 2019 2018 Foreign currency $ 2 $ — $ 2 $ — Cross-currency swaps $ 11 $ 3 $ 16 $ 10 Foreign currency denominated debt $ 23 $ 4 $ 28 $ 20 Derivatives designated as net investment hedge instruments as defined by ASC 815 held during the period resulted in the following gains recorded in Interest expense and finance charges on components excluded from the assessment of effectiveness: (in millions) Three Months Ended September 30, Nine Months Ended September 30, Net investment hedges 2019 2018 2019 2018 Cross-currency swaps $ 3 $ 3 $ 8 $ 6 There were no gains or losses recorded in income related to components excluded from the assessment of effectiveness for foreign currency denominated debt designated as net investment hedges. There were no gains and losses reclassified from AOCI for net investment hedges during the periods presented. Derivatives not designated as hedging instruments are used to hedge remeasurement exposures of monetary assets and liabilities denominated in currencies other than the operating units' functional currency. These derivatives resulted in the following gains and (losses) recorded in income: (in millions) Three Months Ended September 30, Nine Months Ended September 30, Contract Type Location 2019 2018 2019 2018 Foreign Currency Selling, general and administrative expenses $ — $ 1 $ (3 ) $ —

Retirement Benefit Plans

Retirement Benefit Plans	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans The Company has a number of defined benefit pension plans and other postretirement benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2019 range from $15 million to $20 million , of which $12 million has been contributed through the first nine months of the year. The other postretirement benefit plans, which provide medical and life insurance benefits, are unfunded plans. During the nine months ended September 30, 2019, the Company settled approximately $50 million of its pension projected benefit obligation by liquidating approximately $50 million in plan assets through a lump-sum disbursement made to an insurance company. Pursuant to this agreement, the insurance company unconditionally and irrevocably guarantees all future payments to certain participants that were receiving payments from the U.S. pension plan. The insurance company assumes all investment risk associated with the assets that were delivered as part of this transaction. Additionally, during the nine months ended September 30, 2019, the Company discharged certain U.S. pension plan obligations by making lump-sum payments of $13 million to former employees of the Company. As a result, the Company settled $63 million of projected benefit obligation by liquidating pension plan assets and recorded a non-cash settlement loss of $26 million related to the accelerated recognition of unamortized losses. The components of net periodic benefit cost recorded in the Condensed Consolidated Statements of Operations are as follows: Pension benefits Other postretirement employee benefits (in millions) 2019 2018 Three Months Ended September 30, US Non-US US Non-US 2019 2018 Service cost $ — $ 5 $ — $ 5 $ — $ — Interest cost 2 3 2 3 — 1 Expected return on plan assets (3 ) (6 ) (3 ) (7 ) — — Amortization of unrecognized prior service credit (1 ) — (1 ) — (1 ) (1 ) Amortization of unrecognized loss 2 2 1 1 1 — Net periodic benefit cost (income) $ — $ 4 $ (1 ) $ 2 $ — $ — Pension benefits Other postretirement employee benefits (in millions) 2019 2018 Nine Months Ended September 30, US Non-US US Non-US 2019 2018 Service cost $ — $ 14 $ — $ 14 $ — $ — Interest cost 7 9 6 9 2 2 Expected return on plan assets (9 ) (17 ) (10 ) (21 ) — — Settlement 26 — — — — — Amortization of unrecognized prior service credit (1 ) — (1 ) — (3 ) (3 ) Amortization of unrecognized loss 4 7 3 5 1 1 Net periodic benefit cost (income) $ 27 $ 13 $ (2 ) $ 7 $ — $ — The components of net periodic benefit cost other than the service cost component are included in Other postretirement (income) expense in the Condensed Consolidated Statements of Operations.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company has granted restricted common stock and restricted stock units (collectively, "restricted stock") and performance share units as long-term incentive awards to employees and non-employee directors under the BorgWarner Inc. 2014 Stock Incentive Plan, as amended ("2014 Plan") and the BorgWarner Inc. 2018 Stock Incentive Plan ("2018 Plan"). The Company's Board of Directors adopted the 2018 Plan as a replacement to the 2014 Plan in February 2018, and the Company's stockholders approved the 2018 Plan at the annual meeting of stockholders on April 25, 2018. After stockholders approved the 2018 Plan, the Company could no longer make grants under the 2014 Plan. The shares that were available for issuance under the 2014 Plan were cancelled upon approval of the 2018 Plan. The 2018 Plan authorizes the issuance of a total of 7 million shares, of which approximately 6 million shares were available for future issuance as of September 30, 2019. Restricted stock In the first nine months of 2019, the Company granted restricted stock in the amounts of 1,054,006 shares and 23,880 shares to employees and non-employee directors, respectively. Restricted stock granted to employees generally vests 50% after two years and the remainder after three years . Restricted stock granted to non-employee directors generally vests on the first anniversary of the date of grant. The Company recognizes the value of the restricted stock, which is equal to the market value of the Company’s common stock on the date of grant, as compensation expense ratably over the restricted stock's vesting period. As of September 30, 2019, the Company had $45 million of unrecognized compensation expense that will be recognized over a weighted average period of 1.9 years. The Company recorded restricted stock compensation expense of $8 million and $7 million for the three months ended September 30, 2019 and 2018, respectively, and $22 million and $19 million for the nine months ended September 30, 2019 and 2018, respectively. A summary of the Company’s nonvested restricted stock for the nine months ended September 30, 2019 is as follows: Shares subject to restriction (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 1,516 $ 42.97 Granted 930 $ 41.92 Vested (665 ) $ 35.94 Forfeited (6 ) $ 45.41 Nonvested at March 31, 2019 1,775 $ 44.77 Granted 125 $ 40.78 Vested (28 ) $ 50.43 Forfeited (37 ) $ 45.13 Nonvested at June 30, 2019 1,835 $ 44.40 Granted 22 $ 36.68 Vested (7 ) $ 43.81 Forfeited (30 ) $ 44.99 Nonvested at September 30, 2019 1,820 $ 44.29 Total Stockholder Return Performance Share Units The Company grants performance share units to members of senior management that vest at the end of three-year periods based on the Company's total stockholder return relative to a peer group of companies. The Company recorded compensation expense of $2 million and $3 million for the three months ended September 30, 2019 and 2018, respectively, and $5 million and $6 million for the nine months ended September 30, 2019 and 2018, respectively. A summary of the status of the Company’s nonvested total stockholder return performance share units for the nine months ended September 30, 2019 is as follows: Number of shares (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 297 $ 60.35 Granted 190 $ 51.52 Forfeited (9 ) $ 55.30 Nonvested at March 31, 2019 478 $ 56.93 Granted 5 $ 51.59 Forfeited (56 ) $ 55.67 Nonvested at June 30, 2019 427 $ 57.03 Forfeited (5 ) $ 57.29 Nonvested at September 30, 2019 422 $ 57.03 Relative Revenue Growth Performance Share Units The Company also grants performance share units to members of senior management that vest based on the Company's revenue growth relative to the vehicle market over three-year performance periods. The Company recorded compensation expense of $3 million and $5 million for the three months ended September 30, 2019 and 2018, respectively, and, $3 million and $13 million for the nine months ended September 30, 2019 and 2018, respectively. A summary of the status of the Company’s nonvested relative revenue growth performance share units for the nine months ended September 30, 2019 is as follows: Number of shares (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 297 $ 47.03 Granted 190 $ 41.90 Forfeited (9 ) $ 44.12 Nonvested at March 31, 2019 478 $ 45.04 Granted 5 $ 41.92 Forfeited (56 ) $ 44.24 Nonvested at June 30, 2019 427 $ 45.11 Forfeited (5 ) $ 44.76 Nonvested at September 30, 2019 422 $ 45.11 In 2018, the Company modified the vesting provisions of restricted stock and performance share unit grants made to certain retiring executive officers to allow certain of the outstanding awards, that otherwise would have been forfeited, to vest upon retirement. This resulted in net restricted stock and performance share unit compensation expense of $6 million for the three months ended September 30, 2018 and $2 million for both the nine months ended September 30, 2019 and 2018.

Stockholder's Equity

Stockholder's Equity	9 Months Ended
	Sep. 30, 2019
Statement of Financial Position [Abstract]
Stockholders' Equity Note Disclosure	Stockholder's Equity The changes of the Stockholder's Equity items during the three and nine months ended September 30, 2019 and 2018, are as follows: BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, June 30, 2019 $ 3 $ 1,116 $ (1,653 ) $ 5,598 $ (670 ) $ 108 Dividends declared ($0.17 per share) * — — — (35 ) — 1 Contributions — — — — — 4 Net issuance for executive stock plan — 4 1 — — — Net issuance of restricted stock — 9 (1 ) — — — Net earnings — — — 194 — 13 Other comprehensive loss — — — — (109 ) (5 ) Balance, September 30, 2019 $ 3 $ 1,129 $ (1,653 ) $ 5,757 $ (779 ) $ 121 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, June 30, 2018 $ 3 $ 1,110 $ (1,544 ) $ 4,973 $ (582 ) $ 94 Dividends declared ($0.17 per share) * — — — (35 ) — 1 Net issuance for executive stock plan — 9 — — — — Net issuance of restricted stock — 8 (1 ) — — — Purchase of treasury stock — — (36 ) — — — Net earnings — — — 204 — 12 Other comprehensive income (loss) — — — — (41 ) (3 ) Balance, September 30, 2018 $ 3 $ 1,127 $ (1,581 ) $ 5,142 $ (623 ) $ 104 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, December 31, 2018 $ 3 $ 1,146 $ (1,585 ) $ 5,336 $ (674 ) $ 119 Dividends declared ($0.51 per share) * — — — (105 ) — (29 ) Contributions — — — — — 4 Net issuance for executive stock plan — (5 ) 8 — — — Net issuance of restricted stock — (12 ) 24 — — — Purchase of treasury stock — — (100 ) — — — Net earnings — — — 526 — 34 Other comprehensive loss — — — — (105 ) (7 ) Balance, September 30, 2019 $ 3 $ 1,129 $ (1,653 ) $ 5,757 $ (779 ) $ 121 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, December 31, 2017 $ 3 $ 1,118 $ (1,445 ) $ 4,531 $ (490 ) $ 109 Dividends declared ($0.51 per share) * — — — (106 ) — (34 ) Net issuance for executive stock plan — 10 5 — — — Net issuance of restricted stock — (1 ) 9 — — — Purchase of treasury stock — — (150 ) — — — Adoption of accounting standards — — — 16 (14 ) — Net earnings — — — 701 — 36 Other comprehensive income (loss) — — — — (119 ) (7 ) Balance, September 30, 2018 $ 3 $ 1,127 $ (1,581 ) $ 5,142 $ (623 ) $ 104 ____________________________________ * The dividends declared relate to BorgWarner common stock.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following tables summarize the activity within accumulated other comprehensive loss during the three and nine months ended September 30, 2019 and 2018: (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, June 30, 2019 $ (463 ) $ (1 ) $ (208 ) $ 2 $ (670 ) Comprehensive (loss) income before reclassifications (107 ) — 3 — (104 ) Income taxes associated with comprehensive (loss) income before reclassifications (7 ) — (1 ) — (8 ) Reclassification from accumulated other comprehensive loss — 1 3 — 4 Income taxes reclassified into net earnings — — (1 ) — (1 ) Ending balance, September 30, 2019 $ (577 ) $ — $ (204 ) $ 2 $ (779 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, June 30, 2018 $ (375 ) $ (3 ) $ (207 ) $ 3 $ (582 ) Comprehensive (loss) income before reclassifications (45 ) 2 (1 ) — (44 ) Income taxes associated with comprehensive (loss) income before reclassifications 2 — — — 2 Reclassification from accumulated other comprehensive loss — — 2 — 2 Income taxes reclassified into net earnings — — (1 ) — (1 ) Ending balance, September 30, 2018 $ (418 ) $ (1 ) $ (207 ) $ 3 $ (623 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, December 31, 2018 $ (441 ) $ — $ (235 ) $ 2 $ (674 ) Comprehensive (loss) income before reclassifications (127 ) (1 ) 7 — (121 ) Income taxes associated with comprehensive (loss) income before reclassifications (9 ) — (2 ) — (11 ) Reclassification from accumulated other comprehensive loss — 1 34 — 35 Income taxes reclassified into net earnings — — (8 ) — (8 ) Ending balance, September 30, 2019 $ (577 ) $ — $ (204 ) $ 2 $ (779 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, December 31, 2017 $ (294 ) $ (1 ) $ (198 ) $ 3 $ (490 ) Adoption of Accounting Standards — — (14 ) — (14 ) Comprehensive (loss) income before reclassifications (132 ) (4 ) 1 — (135 ) Income taxes associated with comprehensive (loss) income before reclassifications 8 1 — — 9 Reclassification from accumulated other comprehensive loss — 4 6 — 10 Income taxes reclassified into net earnings — (1 ) (2 ) — (3 ) Ending balance, September 30, 2018 $ (418 ) $ (1 ) $ (207 ) $ 3 $ (623 )

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases of Lessee Disclosure	Leases The majority of the Company's global lease portfolio represents leases of real estate, such as manufacturing facilities, warehouses, and office buildings, while the remainder represents leases of personal property, such as vehicle leases, manufacturing and IT equipment. Most of the leases are operating leases with options to renew, with renewal terms that can extend the lease term from 1 to 5 years . The option to renew is included in the lease term if it is reasonably certain that the Company will exercise that option. Certain leases also include options to terminate or purchase the leased asset. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option that is reasonably certain of exercise. The amount recognized in lease assets and liabilities for lease arrangements that include an option for renewal or early termination that is reasonably certain of being exercised is immaterial. The Company's lease agreements do not contain any material residual value guarantee or material restrictive covenants. The Company's policy is to account for the lease and non-lease components as a single lease component for all asset classes. ASC 842 requires that the rate implicit in the lease be used if readily determinable. Generally, implicit rates are not readily determinable in the Company's contracts and the incremental borrowing rate is used for each lease arrangement. The incremental borrowing rates are determined using rates specific to the term of the lease, economic environments where lease activity is concentrated, value of lease portfolio, and assuming full collateralization of the loans. All leases with an initial term of 12 months or less that do not include an option to extend or purchase the underlying asset that the Company is reasonably certain to exercise ("short-term leases") are not recorded on the consolidated balance sheet, and lease expense is recognized on a straight-line basis over the lease term. The following table presents the operating lease assets and lease liabilities as of September 30, 2019: (in millions) September 30, 2019 Assets Operating lease assets Other non-current assets $ 88 Total operating lease assets $ 88 Liabilities Current Operating lease liabilities Accounts payable and accrued expenses $ 19 Noncurrent Operating lease liabilities Other non-current liabilities 68 Total operating lease liabilities $ 87 In the three and nine months ended September 30, 2019, the Company recorded operating lease cost of $6 million and $19 million , respectively, reflected in Selling, general and administrative expenses in the Condensed Consolidated Statement of Operations. The finance lease cost including amortization of leased assets and interest on lease liabilities was less than $1 million in the nine months ended September 30, 2019. Variable costs for the nine months ended September 30, 2019 are immaterial, and the Company does not have sublease income or gains/losses on sale leaseback transactions. The following table presents the maturity of lease liabilities as of September 30, 2019: (in millions) Operating Leases 2019 (excluding the nine months ended September 30, 2019) $ 5 2020 20 2021 15 2022 12 2023 9 After 2023 39 Total (undiscounted) lease payments $ 100 Less: Imputed interest 13 Present value of lease liabilities $ 87 Total rent expense was $12 million and $33 million for the three and nine months ended September 30, 2018. Future minimum operating lease payments at December 31, 2018 were as follows: (in millions) 2019 $ 24 2020 21 2021 15 2022 13 2023 10 After 2023 38 Total minimum lease payments $ 121 The following table presents the lease terms and discount rates as of September 30, 2019: Weighted-average remaining lease term (years) Operating leases 8 Finance leases 3 Weighted-average discount rate Operating leases 2.8 % Finance leases 3.3 % The operating cash flows for operating leases were $19 million for the nine months ended September 30, 2019. As of September 30, 2019, the operating and finance leases that the Company signed but have not yet commenced are immaterial.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company's environmental and product liability contingencies are discussed separately below. In the normal course of business, the Company is also party to various other commercial and legal claims, actions and complaints, including matters involving warranty claims, intellectual property claims, general liability and various other risks. It is not possible to predict with certainty whether or not the Company will ultimately be successful in any of these other commercial and legal matters or, if not, what the impact might be. The Company's management does not expect that an adverse outcome in any of these other commercial and legal claims, actions and complaints will have a material adverse effect on the Company's results of operations, financial position or cash flows, although it could be material to the results of operations in a particular quarter. Environmental The Company and certain of its current and former direct and indirect corporate predecessors, subsidiaries and divisions have been identified by the United States Environmental Protection Agency and certain state environmental agencies and private parties as potentially responsible parties (“PRPs”) at various hazardous waste disposal sites under the Comprehensive Environmental Response, Compensation and Liability Act (“Superfund”) and equivalent state laws. The PRPs may currently be liable for the cost of clean-up and other remedial activities at 27 such sites. Responsibility for clean-up and other remedial activities at a Superfund site is typically shared among PRPs based on an allocation formula. The Company believes that none of these matters, individually or in the aggregate, will have a material adverse effect on its results of operations, financial position or cash flows. Generally, this is because either the estimates of the maximum potential liability at a site are not material or the liability will be shared with other PRPs, although no assurance can be given with respect to the ultimate outcome of any such matter. The Company has an accrual for environmental liabilities of $8 million and $9 million as of September 30, 2019 and December 31, 2018, respectively. This accrual is based on information available to the Company (which in most cases includes an estimate of allocation of liability among PRPs; the probability that other PRPs, many of whom are large, solvent public companies, will fully pay the cost apportioned to them; currently available information from PRPs and/or federal or state environmental agencies concerning the scope of contamination and estimated remediation and consulting costs; and remediation alternatives). Asbestos-related Liability Like many other industrial companies that have historically operated in the United States, the Company, or parties that the Company is obligated to indemnify, continues to be named as one of many defendants in asbestos-related personal injury actions. The Company vigorously defends against these claims. The Company has been successful in obtaining the dismissal of the majority of the claims asserted against it without any payment. Du e to the nature of the fibers used in certain types of automotive products, the encapsulation of the asbestos, and the manner of the products’ use, the Company believes that these products were and are highly unlikely to cause harm. Furthermore, the useful life of nearly all of these products expired many years ago. The Company likewise expects that no payment on these claims will be made by the Company or its insurance carriers in the vast majority of current and future asbestos-related claims. The Company’s asbestos-related claims activity during the nine months ended September 30, 2019 and 2018 is as follows: 2019 2018 Beginning Claims January 1 8,598 9,225 New Claims Received 1,667 1,460 Dismissed Claims (967 ) (1,430 ) Settled Claims (237 ) (268 ) Ending Claims September 30 9,061 8,987 From the mid-2000s through September 30, 2019 and December 31, 2018, the Company incurred $608 million and $574 million , respectively, in asbestos-related claim resolution costs (including settlement payments and judgments) and associated defense costs. During the nine months ended September 30, 2019 and 2018, the Company paid $32 million and $37 million , respectively, in asbestos-related claim resolution costs and associated defense costs. These gross payments are before tax benefits and any potential insurance receipts. Asbestos-related claim resolution costs and associated defense costs are reflected in the Company's operating cash flows. The Company reviews, on an ongoing basis, its own experience in handling asbestos-related claims and trends affecting asbestos-related claims in the U.S. tort system generally, for the purposes of assessing the value of pending asbestos-related claims and the number and value of those that may be asserted in the future, as well as potential recoveries from the Company’s insurance carriers with respect to such claims and defense costs. The Company has accrued estimated amounts in its consolidated financial statements on account of asbestos-related claims that have been asserted but not yet resolved and for claims that have not yet been asserted. The Company's estimate of asbestos-related claim resolution costs and associated defense costs is not discounted to present value and includes an estimate of liability for potential future claims not yet asserted through December 31, 2064 with a runoff through 2074. The Company currently believes that December 31, 2074 is a reasonable assumption as to the last date on which it is likely to have resolved all asbestos-related claims, based on the nature and useful life of the Company’s products and the likelihood of incidence of asbestos-related disease in the U.S. population generally. As of September 30, 2019 and September 30, 2018, the Company’s reasonable best estimate of the aggregate liability for both asbestos-related claims asserted but not yet resolved and potential asbestos-related claims not yet asserted, including estimated defense costs, is as follows: (in millions) 2019 2018 Beginning asbestos liability as of January 1 $ 805 $ 828 Claim resolution costs and associated defense costs (33 ) (36 ) Ending asbestos liability as of September 30 $ 772 $ 792 The Company’s estimate of the claim resolution costs and associated defense costs for asbestos-related claims asserted but not yet resolved and potential claims not yet asserted is its reasonable best estimate of such costs. Such estimate is subject to numerous uncertainties. These include future legislative or judicial changes affecting the U.S. tort system, bankruptcy proceedings involving one or more co-defendants, the impact and timing of payments from bankruptcy trusts that currently exist and those that may exist in the future, disease emergence and associated claim filings, the impact of future settlements or significant judgments, changes in the medical condition of claimants, changes in the treatment of asbestos-related disease, and any changes in settlement or defense strategies. The balances recorded for asbestos-related claims are based on the best available information and assumptions that the Company believes are reasonable, including as to the number of future claims that may be asserted, the percentage of claims that may result in a payment, the average cost to resolve such claims, and potential defense costs. The Company has concluded that it is reasonably possible that it may incur additional losses through 2074 for asbestos-related claims, in addition to amounts recorded, of up to approximately $100 million as of September 30, 2019 and December 31, 2018. The various assumptions utilized in arriving at the Company’s estimate may also change over time, and the Company’s actual liability for asbestos-related claims asserted but not yet resolved and those not yet asserted may be higher or lower than the Company’s estimate as a result of such changes. The Company has certain insurance coverage applicable to asbestos-related claims including primary insurance and excess insurance coverage. Prior to June 2004, claim resolution costs and defense costs associated with all asbestos-related claims were paid by the Company's primary layer insurance carriers under a series of interim funding arrangements. In June 2004, primary layer insurance carriers notified the Company of the alleged exhaustion of their policy limits. A declaratory judgment action was filed in January 2004 in the Circuit Court of Cook County, Illinois by Continental Casualty Company and related companies against the Company and certain of its historical general liability insurance carriers. The Cook County court has issued a number of interim rulings, and discovery is continuing in this proceeding. The Company is vigorously pursuing the litigation against all insurance carriers that continue to be parties to it, which currently includes excess insurance carriers, as well as pursuing settlement discussions with its insurance carriers where appropriate. The Company has entered into settlement agreements with certain of its insurance carriers, resolving such insurance carriers’ coverage disputes through the insurance carriers’ agreement to pay specified amounts to the Company, either immediately or over a specified period. Through September 30, 2019 and December 31, 2018, the Company received $272 million and $271 million , respectively, in cash and notes from insurance carriers on account of asbestos-related claim resolution costs and associated defense costs. As of September 30, 2019 and December 31, 2018, the Company estimates that it has $385 million and $386 million , respectively, in aggregate insurance coverage available with respect to asbestos-related claims, and their associated defense costs. The Company has recorded this insurance coverage as a long-term receivable for asbestos-related claim resolution costs and associated defense costs that have been incurred, less cash and notes received, and remaining limits as a deferred insurance asset with respect to liabilities recorded for potential future costs for asbestos-related claims. The Company has determined the amount of that estimate by taking into account the remaining limits of the insurance coverage, the number and amount of potential claims from co-insured parties, potential remaining recoveries from insolvent insurance carriers, the impact of previous insurance settlements, and coverage available from solvent insurance carriers not party to the coverage litigation. The Company’s estimated remaining insurance coverage relating to asbestos-related claims and their associated defense costs is the subject of disputes with its insurance carriers, substantially all of which are being adjudicated in the Cook County insurance litigation. The Company believes that its insurance receivable is probable of collection notwithstanding those disputes based on, among other things, the arguments made by the insurance carriers in the Cook County litigation and evaluation of those arguments by the Company and its counsel, the case law applicable to the issues in dispute, the rulings to date by the Cook County court, the absence of any credible evidence alleged by the insurance carriers that they are not liable to indemnify the Company, and the fact that the Company has recovered a substantial portion of its insurance coverage, $272 million , through September 30, 2019, from its insurance carriers under similar policies. However, the resolution of the insurance coverage disputes, and the number and amount of claims on our insurance from co-insured parties, may increase or decrease the amount of such insurance coverage available to the Company as compared to the Company’s estimate. The amounts recorded in the Condensed Consolidated Balance Sheets respecting asbestos-related claims are as follows: September 30, December 31, (in millions) 2019 2018 Assets: Other long-term asbestos-related insurance receivables $ 336 $ 303 Deferred asbestos-related insurance asset 49 83 Total insurance assets $ 385 $ 386 Liabilities: Accounts payable and accrued expenses $ 49 $ 50 Other non-current liabilities 723 755 Total accrued liabilities $ 772 $ 805 On July 31, 2018, the Division of Enforcement of the Securities and Exchange Commission ("SEC") informed the Company that it is conducting an investigation related to the Company's accounting for asbestos-related claims not yet asserted. The Company is fully cooperating with the SEC in connection with its investigation.

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring In 2017, the Company initiated actions within its Engine segment designed to improve future profitability and competitiveness and started exploring strategic options for the non-core product lines. As a continuation of these actions, the Company recorded restructuring expense of $3 million and $14 million during the three and nine months ended September 30, 2019, respectively, and $5 million and $38 million during the three and nine months ended September 30, 2018, respectively, primarily related to professional fees and employee termination benefits. The Company is taking several actions to reduce existing structural costs. The Company recorded $3 million in the Engine segment and $1 million in the Drivetrain segment in the three months ended September 30, 2019 related to these actions. Additionally, the Company initiated a voluntary termination program in the Engine segment and recorded restructuring expense of $7 million and $18 million in the three and nine months ended September 30, 2019, respectively. The Company also recorded restructuring expense of $3 million in the nine months ended September 30, 2019, related to Corporate restructuring activities. The Company recorded restructuring expense of $6 million in the nine months ended September 30, 2018 in the Drivetrain segment primarily related to manufacturing footprint rationalization activities. Estimates of restructuring expense are based on information available at the time such charges are recorded. Due to the inherent uncertainty involved in estimating restructuring expenses, actual amounts paid for such activities may differ from amounts initially recorded. Accordingly, the Company may record revisions of previous estimates by adjusting previously established accruals. The Company intends to continue its plan to reduce existing structural costs in order to improve the competitiveness of its business and maintain its margin profile. These actions may result in the recognition of additional restructuring charges that could be material. The following tables display a rollforward of the severance accruals recorded within the Company's Condensed Consolidated Balance Sheet and the related cash flow activity for the three and nine months ended September 30, 2019 and 2018: Severance Accruals (in millions) Drivetrain Engine Total Balance at December 31, 2018 $ 4 $ 21 $ 25 Provision — 7 7 Cash payments — (20 ) (20 ) Balance at March 31, 2019 $ 4 $ 8 $ 12 Provision — 8 8 Cash payments — (2 ) (2 ) Balance at June 30, 2019 $ 4 $ 14 $ 18 Provision — 8 8 Cash payments (1 ) (7 ) (8 ) Balance at September 30, 2019 $ 3 $ 15 $ 18 Severance Accruals (in millions) Drivetrain Engine Total Balance at December 31, 2017 $ 4 $ 1 $ 5 Provision 1 1 2 Cash payments (1 ) (1 ) (2 ) Translation adjustment 1 — 1 Balance at March 31, 2018 $ 5 $ 1 $ 6 Provision 1 26 27 Cash payments (1 ) (5 ) (6 ) Balance at June 30, 2018 $ 5 $ 22 $ 27 Provision — 2 2 Cash payments (4 ) (6 ) (10 ) Balance at September 30, 2018 $ 1 $ 18 $ 19

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The Company presents both basic and diluted earnings per share of common stock (“EPS”). Basic EPS is calculated by dividing net earnings attributable to the Company by the weighted average shares of common stock outstanding during the reporting period. Diluted EPS is calculated by dividing net earnings attributable to the Company by the weighted average shares of common stock and common equivalent stock outstanding during the reporting period. The dilutive impact of stock-based compensation is calculated using the treasury stock method. The treasury stock method assumes that the Company uses the assumed proceeds from the exercise of awards to repurchase common stock at the average market price during the period. The assumed proceeds under the treasury stock method include the purchase price that the grantee will pay in the future and compensation cost for future service that the Company has not yet recognized. The dilutive effects of performance-based stock awards described in the Note 14, "Stock-Based Compensation," to the Condensed Consolidated Financial Statements are included in the computation of diluted earnings per share at the level the related performance criteria are met through the respective balance sheet date. The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock: Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share amounts) 2019 2018 2019 2018 Basic earnings per share: Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701 Weighted average shares of common stock outstanding 205.3 207.5 205.9 208.5 Basic earnings per share of common stock $ 0.94 $ 0.98 $ 2.56 $ 3.36 Diluted earnings per share: Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701 Weighted average shares of common stock outstanding 205.3 207.5 205.9 208.5 Effect of stock-based compensation 1.0 1.2 0.9 1.3 Weighted average shares of common stock outstanding including dilutive shares 206.3 208.7 206.8 209.8 Diluted earnings per share of common stock $ 0.94 $ 0.98 $ 2.54 $ 3.34 Anti-dilutive stock-based awards excluded from the calculation of diluted earnings per share: 0.1 0.1 0.1 0.1

Reporting Segments

Reporting Segments	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Reporting Segments	Reporting Segments The Company's business is comprised of two reporting segments: Engine and Drivetrain. These segments are strategic business groups that are managed separately as each represents a specific grouping of related automotive components and systems. The Company allocates resources to each segment based upon the projected after-tax return on invested capital ("ROIC") of its business initiatives. Adjusted EBIT is comprised of earnings before interest, income taxes and noncontrolling interest (“EBIT") adjusted for restructuring, goodwill impairment charges, affiliates' earnings and other items not reflective of on-going operating income or loss ("Adjusted EBIT"). ROIC is comprised of Adjusted EBIT after deducting notional taxes compared to the projected average capital investment required. Adjusted EBIT is the measure of segment income or loss used by the Company. The Company believes Adjusted EBIT is most reflective of the operational profitability or loss of our reporting segments. The following tables show segment information and Adjusted EBIT for the Company's reporting segments. Net Sales by Reporting Segment Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Engine $ 1,514 $ 1,516 $ 4,681 $ 4,906 Drivetrain 993 976 2,973 3,093 Inter-segment eliminations (15 ) (14 ) (45 ) (43 ) Net sales $ 2,492 $ 2,478 $ 7,609 $ 7,956 Adjusted EBIT Three Months Ended September 30, Nine Months Ended (in millions) 2019 2018 2019 2018 Engine $ 241 $ 238 $ 731 $ 797 Drivetrain 100 108 307 345 Adjusted EBIT 341 346 1,038 1,142 Restructuring expense 14 5 41 44 Merger, acquisition and divestiture expense 4 2 10 5 Other expense (income) — 2 14 (3 ) Officer stock awards modification — 6 2 2 Corporate, including stock-based compensation 47 53 146 170 Equity in affiliates' earnings, net of tax (7 ) (15 ) (25 ) (38 ) Interest income (4 ) (1 ) (9 ) (4 ) Interest expense 15 14 43 45 Other postretirement (income) expense (1 ) (3 ) 26 (8 ) Earnings before income taxes and noncontrolling interest 273 283 790 929 Provision for income taxes 66 67 230 192 Net earnings 207 216 560 737 Net earnings attributable to the noncontrolling interest, net of tax 13 12 34 36 Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701 Total Assets September 30, December 31, (in millions) 2019 2018 Engine $ 4,638 $ 4,731 Drivetrain 3,865 3,920 Total 8,503 8,651 Corporate * 1,696 1,444 Total assets $ 10,199 $ 10,095 ____________________________________ * Corporate assets include investments and other long-term receivables and certain deferred income taxes.

Recent Transactions

Recent Transactions	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Business Combination Disclosure	Recent Transactions Romeo Power Technology In May 2019, the Company invested $50 million in exchange for a 20% equity interest in Romeo Power Technology ("Romeo"), a technology-leading battery module and pack supplier. The Company accounts for this investment in Series A-1 Preferred Stock of Romeo under the measurement alternative in ASC 321, "Investments - Equity Securities" for equity investments without a readily determinable fair value. Such investments are measured at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer. In September 2019, the Company and Romeo contributed total equity of $10 million and formed a new joint venture, BorgWarner Romeo Power LLC (the "Romeo JV"), in which the Company owns 60% interest. The Romeo JV is a variable interest entity focusing on producing battery module and pack technology. The Company is the primary beneficiary of the Romeo JV and consolidates the Romeo JV in its consolidated financial statements. Rinehart Motion Systems LLC and AM Racing LLC On January 2, 2019 , the Company acquired Rinehart Motion Systems LLC and AM Racing LLC, two established companies in the specialty electric and hybrid propulsion market, for approximately $15 million , of which $10 million was paid in the first quarter of 2019 and the remaining $5 million will be paid upon satisfaction of certain conditions. The Company created Cascadia Motion LLC ("Cascadia Motion") to combine assets and operations of these two acquired companies. Based in Oregon, Cascadia Motion specializes in design, development and production of hybrid and electric propulsion solutions for prototype and low-volume production applications. It allows the Company to offer design, development and production of full electric and hybrid propulsion systems for niche and low-volume manufacturing applications. In connection with the acquisition, the Company recognized intangible assets of $5 million , goodwill of $7 million within the Drivetrain reporting segment, and other assets and liabilities of $2 million to reflect the preliminary fair value of the assets acquired and liabilities assumed. The intangible assets are being amortized over a period of 2 to 15 years . Various valuation techniques were used to determine the fair value of the intangible assets, with the primary techniques being forms of the income approach, which use significant unobservable inputs, or Level 3 inputs, as defined by the fair value hierarchy. Under these valuation approaches, the Company is required to make estimates and assumptions about sales, operating margins, growth rates, royalty rates and discount rates based on budgets, business plans, economic projections, anticipated future cash flows and marketplace data. Due to the nature of the transaction, goodwill is not deductible for tax purposes. The Company is in the process of finalizing all purchase accounting adjustments related to the acquisition of Cascadia Motion. Certain estimated values for the acquisition, including goodwill, intangible assets and deferred taxes, are not yet finalized, and the preliminary purchase price allocations are subject to change as the Company completes its analysis of the fair value as of the date of acquisition. Due to its insignificant size relative to the Company, supplemental pro forma financial information of the combined entity for the current and prior reporting period is not provided.

Assets and Liabilities Held for

Assets and Liabilities Held for Sale	9 Months Ended
	Sep. 30, 2019
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure	Assets and Liabilities Held For Sale In 2017, the Company started exploring strategic options for non-core product lines in the Engine segment, launched an active program to locate a buyer and initiated all other actions required to complete the plan to sell and exit the non-core pipe and thermostat product lines. During 2018, the Company continued its marketing efforts with interested parties and engaged in active discussions with these parties. In December 2018, after finalizing negotiations regarding various aspects of the sale, the Company entered into a definitive agreement to sell its thermostat product lines for approximately $28 million subject to customary adjustments. All closing conditions were satisfied, and the sale was closed on April 1, 2019. The Company received cash proceeds of $27 million in the nine months ended September 30, 2019. Additionally, during the nine months ended September 30, 2019, the Company entered into agreements to transition its pipes product lines to multiple buyers for inconsequential proceeds. Based on the cash proceeds in conjunction with the closing of the transaction to sell the thermostat product lines, the Company determined no additional gain or loss on sale was required during the nine months ended September 30, 2019. During the nine months ended September 30, 2019, the assets and liabilities were removed from the Condensed Consolidated Balance Sheet. The business did not meet the criteria to be classified as a discontinued operation. The Company is in the process of finalizing all purchase price adjustments related to the sale of non-core product lines. Subsequent adjustments may be necessary based on the finalization of this process. The assets and liabilities classified as held for sale at December 31, 2018 were as follows: December 31, (millions of dollars) 2018 Receivables, net $ 15 Inventories, net 42 Prepayments and other current assets 12 Property, plant and equipment, net 45 Goodwill 7 Other intangible assets, net 20 Impairment of carrying value (94 ) Total assets held for sale $ 47 Accounts payable and accrued expenses $ 18 Other liabilities 5 Total liabilities held for sale $ 23

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On October 30, 2019, the Company entered into a definitive agreement with Enstar Holdings (US) LLC (“Enstar”), a subsidiary of Enstar Group Limited, pursuant to which Enstar acquired 100% of the equity interests of BorgWarner Morse TEC LLC ("Morse TEC"), a consolidated wholly-owned subsidiary of the Company that holds asbestos and certain other liabilities. In connection with the closing, the Company contributed approximately $172 million in cash to Morse TEC. As a result of this transaction, the Company expects to remove the asbestos obligations, related insurance assets and associated deferred tax assets from the Company's Condensed Consolidated Balance Sheet. The Company is evaluating the accounting for this transaction, but currently estimates that this transaction could result in an after-tax loss in its consolidated financial statements of up to $40 million

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy [Policy Text Block]
Use of Estimates, Policy [Policy Text Block]	Management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and accompanying notes, as well as the amounts of revenues and expenses reported during the periods covered by those financial statements and accompanying notes. Actual results could differ from these estimates.

Schedule of New Accounting Pron

Schedule of New Accounting Pronouncements (Tables)	9 Months Ended
	Sep. 30, 2019
Statement of Financial Position [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	(in millions) Balance at December 31, 2018 Adjustments due to ASC 842 Balance at January 1, 2019 Other non-current assets $ 502 $ 104 $ 606 Accounts payable and accrued expenses $ 2,144 $ 23 $ 2,167 Other non-current liabilities $ 357 $ 80 $ 437

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Three Months Ended September 30, 2019 Three Months Ended September 30, 2018 (In millions) Engine Drivetrain Total Engine Drivetrain Total North America $ 397 $ 456 $ 853 $ 392 $ 452 $ 844 Europe 716 203 919 690 209 899 Asia 357 324 681 386 308 694 Other 30 9 39 33 8 41 Total $ 1,500 $ 992 $ 2,492 $ 1,501 $ 977 $ 2,478 Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 (In millions) Engine Drivetrain Total Engine Drivetrain Total North America $ 1,216 $ 1,362 $ 2,578 $ 1,186 $ 1,341 $ 2,527 Europe 2,277 641 2,918 2,343 748 3,091 Asia 1,053 944 1,997 1,238 982 2,220 Other 91 25 116 95 23 118 Total $ 4,637 $ 2,972 $ 7,609 $ 4,862 $ 3,094 $ 7,956

Research and Development Expe_2

Research and Development Expenditures (Tables)	9 Months Ended
	Sep. 30, 2019
Research and Development [Abstract]
Gross and net expenditures on research and development ("R&D") activities	Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Gross R&D expenditures $ 123 $ 122 $ 372 $ 386 Customer reimbursements (21 ) (14 ) (53 ) (49 ) Net R&D expenditures $ 102 $ 108 $ 319 $ 337

Other Expense, Net (Tables)

Other Expense, Net (Tables)	9 Months Ended
	Sep. 30, 2019
Other Income and Expenses [Abstract]
Schedule of other expense	Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Restructuring expense $ 14 $ 5 $ 41 $ 44 Merger, acquisition and divestiture expense 4 2 10 5 Other expense (income) — — 12 (7 ) Other expense, net $ 18 $ 7 $ 63 $ 42

Inventories, net (Tables)

Inventories, net (Tables)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Schedule of Inventory	September 30, December 31, (in millions) 2019 2018 Raw material and supplies $ 515 $ 485 Work in progress 114 114 Finished goods 195 199 FIFO inventories 824 798 LIFO reserve (14 ) (17 ) Inventories, net $ 810 $ 781

Property, Plant and Equipment_2

Property, Plant and Equipment, net (Tables)	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Disclosure of Property, Plant and Equipment	September 30, December 31, (in millions) 2019 2018 Land, land use rights and buildings $ 843 $ 871 Machinery and equipment 2,894 2,851 Finance lease assets 2 2 Construction in progress 326 426 Total property, plant and equipment, gross 4,065 4,150 Less: accumulated depreciation (1,480 ) (1,473 ) Property, plant and equipment, net, excluding tooling 2,585 2,677 Tooling, net of amortization 227 227 Property, plant and equipment, net $ 2,812 $ 2,904

Product Warranty (Tables)

Product Warranty (Tables)	9 Months Ended
	Sep. 30, 2019
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability	September 30, December 31, (in millions) 2019 2018 Accounts payable and accrued expenses $ 54 $ 56 Other non-current liabilities 47 47 Total product warranty liability $ 101 $ 103 (in millions) 2019 2018 Beginning balance, January 1 $ 103 $ 112 Provisions for current period sales 36 38 Adjustments of prior estimates 9 9 Payments (43 ) (45 ) Translation adjustment and other (4 ) (4 ) Ending balance, September 30 $ 101 $ 110

Notes Payable and Long-Term D_2

Notes Payable and Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	September 30, December 31, (in millions) 2019 2018 Short-term debt Short-term borrowings $ 33 $ 33 Long-term debt 8.00% Senior notes due 10/01/19 ($134 million par value) 134 135 4.625% Senior notes due 09/15/20 ($250 million par value) 251 251 1.80% Senior notes due 11/7/22 (€500 million par value) 542 570 3.375% Senior notes due 03/15/25 ($500 million par value) 497 497 7.125% Senior notes due 02/15/29 ($121 million par value) 119 119 4.375% Senior notes due 03/15/45 ($500 million par value) 494 494 Term loan facilities and other 5 15 Total long-term debt 2,042 2,081 Less: current portion 386 140 Long-term debt, net of current portion $ 1,656 $ 1,941

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value	Basis of fair value measurements (in millions) Balance at Quoted prices in active markets for identical items (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Valuation technique Assets: Foreign currency contracts $ 2 $ — $ 2 $ — A Other long-term receivables (insurance settlement agreement note receivable) $ 35 $ — $ 35 $ — C Net investment hedge contracts $ 28 $ — $ 28 $ — A Liabilities: Foreign currency contracts $ 3 $ — $ 3 $ — A Basis of fair value measurements (in millions) Balance at December 31, 2018 Quoted prices in active markets for identical items (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Valuation technique Assets: Foreign currency contracts $ 3 $ — $ 3 $ — A Other long-term receivables (insurance settlement agreement note receivable) $ 34 $ — $ 34 $ — C Net investment hedge contracts $ 12 $ — $ 12 $ — A Liabilities: Foreign currency contracts $ 2 $ — $ 2 $ — A

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Schedule of Price Risk Derivatives	Commodity derivative contracts Commodity Volume hedged September 30, 2019 Volume hedged December 31, 2018 Units of measure Duration Copper 261 257 Metric Tons Dec - 20
Notional Amounts of Outstanding Derivative Positions	Foreign currency derivatives (in millions) Functional currency Traded currency Notional in traded currency Notional in traded currency December 31, 2018 Ending Duration Brazilian real Euro 2 4 Jan - 20 Brazilian real US dollar 2 5 Dec - 19 British pound Euro 17 — Mar - 20 British pound US dollar 6 — Mar - 20 Chinese renminbi US dollar 10 — Dec - 19 Euro British pound 1 7 Dec - 19 Euro Chinese renminbi 11 — Dec - 19 Euro Japanese yen 131 — Dec - 19 Euro Polish zloty 7 — Dec - 19 Euro Swedish krona 540 540 Jun - 20 Euro US dollar 9 19 Dec - 20 Japanese yen Chinese renminbi 23 89 Dec - 19 Japanese yen Korean won 1,359 5,785 Dec - 19 Japanese yen US dollar 1 3 Dec - 19 Korean won Euro 2 6 Dec - 19 Korean won Japanese yen 54 266 Dec - 19 Korean won US dollar 7 7 Dec - 19 Swedish krona Euro 17 56 Jan - 20 US dollar Euro 14 — Jan - 20 US dollar Japanese yen 1,900 — Dec - 19 US dollar Korean won 36,721 — Dec - 19 US dollar Mexican peso 153 575 Dec - 19
Schedule of Foreign Exchange Contracts, Statement of Financial Position	Cross-Currency Swaps (in millions) Notional in USD Notional in Local Currency Duration Fixed $ to fixed € $ 250 € 206 Sep - 20 Fixed $ to fixed ¥ $ 100 ¥ 10,978 Feb - 23
Derivatives Instruments in Statements of Financial Position	(in millions) Assets Liabilities Derivatives designated as hedging instruments Under 815: Location September 30, 2019 December 31, 2018 Location September 30, 2019 December 31, 2018 Foreign currency Prepayments and other current assets $ 2 $ 2 Accounts payable and accrued expenses $ 3 $ 2 Net investment hedges Prepayments and other current assets $ 26 $ — Accounts payable and accrued expenses $ — $ — Other non-current assets $ 2 $ 12 Other non-current liabilities $ — $ — Derivatives not designated as hedging instruments Foreign currency Prepayments and other current assets $ — $ 1 Accounts payable and accrued expenses $ — $ —
Deferred Losses Reported In Accumulated Other Comprehensive Income Loss	(in millions) Deferred gain (loss) in AOCI at Gain (loss) expected to be reclassified to income in one year or less Contract Type September 30, 2019 December 31, 2018 Net investment hedges: Foreign currency $ 6 $ 4 $ — Cross-currency swaps 28 12 — Foreign currency denominated debt (2 ) (30 ) — Total $ 32 $ (14 ) $ —
Schedule of Derivative Instruments	Three Months Ended September 30, 2019 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 2,492 $ 1,968 $ 230 $ (109 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ — Gain (loss) reclassified from AOCI to income $ (2 ) $ — $ 1 Nine Months Ended September 30, 2019 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 7,609 $ 6,053 $ 668 $ (105 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ (1 ) Gain (loss) reclassified from AOCI to income $ (4 ) $ 1 $ 2 Three Months Ended September 30, 2018 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 2,478 $ 1,963 $ 230 $ (41 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ 2 Gain (loss) reclassified from AOCI to income $ (1 ) $ — $ — Nine Months Ended September 30, 2018 (in millions) Net sales Cost of sales Selling, general and administrative expenses Other comprehensive income(loss) Total amounts of earnings and other comprehensive income(loss) line items in which the effects of cash flow hedges are recorded $ 7,956 $ 6,270 $ 720 $ (119 ) Gain (loss) on cash flow hedging relationships: Foreign currency Gain (loss) recognized in other comprehensive income $ (4 ) Gain (loss) reclassified from AOCI to income $ (2 ) $ (3 ) $ —
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	(in millions) Three Months Ended September 30, Nine Months Ended September 30, Net investment hedges 2019 2018 2019 2018 Foreign currency $ 2 $ — $ 2 $ — Cross-currency swaps $ 11 $ 3 $ 16 $ 10 Foreign currency denominated debt $ 23 $ 4 $ 28 $ 20
Derivative Instruments, Gain (Loss)	(in millions) Three Months Ended September 30, Nine Months Ended September 30, Net investment hedges 2019 2018 2019 2018 Cross-currency swaps $ 3 $ 3 $ 8 $ 6
Derivatives Not Designated as Hedging Instruments	(in millions) Three Months Ended September 30, Nine Months Ended September 30, Contract Type Location 2019 2018 2019 2018 Foreign Currency Selling, general and administrative expenses $ — $ 1 $ (3 ) $ —

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Pension benefits Other postretirement employee benefits (in millions) 2019 2018 Three Months Ended September 30, US Non-US US Non-US 2019 2018 Service cost $ — $ 5 $ — $ 5 $ — $ — Interest cost 2 3 2 3 — 1 Expected return on plan assets (3 ) (6 ) (3 ) (7 ) — — Amortization of unrecognized prior service credit (1 ) — (1 ) — (1 ) (1 ) Amortization of unrecognized loss 2 2 1 1 1 — Net periodic benefit cost (income) $ — $ 4 $ (1 ) $ 2 $ — $ — Pension benefits Other postretirement employee benefits (in millions) 2019 2018 Nine Months Ended September 30, US Non-US US Non-US 2019 2018 Service cost $ — $ 14 $ — $ 14 $ — $ — Interest cost 7 9 6 9 2 2 Expected return on plan assets (9 ) (17 ) (10 ) (21 ) — — Settlement 26 — — — — — Amortization of unrecognized prior service credit (1 ) — (1 ) — (3 ) (3 ) Amortization of unrecognized loss 4 7 3 5 1 1 Net periodic benefit cost (income) $ 27 $ 13 $ (2 ) $ 7 $ — $ —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Restricted Stock Units Activity	Shares subject to restriction (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 1,516 $ 42.97 Granted 930 $ 41.92 Vested (665 ) $ 35.94 Forfeited (6 ) $ 45.41 Nonvested at March 31, 2019 1,775 $ 44.77 Granted 125 $ 40.78 Vested (28 ) $ 50.43 Forfeited (37 ) $ 45.13 Nonvested at June 30, 2019 1,835 $ 44.40 Granted 22 $ 36.68 Vested (7 ) $ 43.81 Forfeited (30 ) $ 44.99 Nonvested at September 30, 2019 1,820 $ 44.29
Schedule of Share-based Compensation, Performance Shares Award Unvested Activity	Number of shares (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 297 $ 47.03 Granted 190 $ 41.90 Forfeited (9 ) $ 44.12 Nonvested at March 31, 2019 478 $ 45.04 Granted 5 $ 41.92 Forfeited (56 ) $ 44.24 Nonvested at June 30, 2019 427 $ 45.11 Forfeited (5 ) $ 44.76 Nonvested at September 30, 2019 422 $ 45.11 Number of shares (thousands) Weighted average grant date fair value Nonvested at December 31, 2018 297 $ 60.35 Granted 190 $ 51.52 Forfeited (9 ) $ 55.30 Nonvested at March 31, 2019 478 $ 56.93 Granted 5 $ 51.59 Forfeited (56 ) $ 55.67 Nonvested at June 30, 2019 427 $ 57.03 Forfeited (5 ) $ 57.29 Nonvested at September 30, 2019 422 $ 57.03

Stockholder's Equity (Tables)

Stockholder's Equity (Tables)	9 Months Ended
	Sep. 30, 2019
Statement of Financial Position [Abstract]
Schedule of Stockholders Equity	BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, June 30, 2019 $ 3 $ 1,116 $ (1,653 ) $ 5,598 $ (670 ) $ 108 Dividends declared ($0.17 per share) * — — — (35 ) — 1 Contributions — — — — — 4 Net issuance for executive stock plan — 4 1 — — — Net issuance of restricted stock — 9 (1 ) — — — Net earnings — — — 194 — 13 Other comprehensive loss — — — — (109 ) (5 ) Balance, September 30, 2019 $ 3 $ 1,129 $ (1,653 ) $ 5,757 $ (779 ) $ 121 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, June 30, 2018 $ 3 $ 1,110 $ (1,544 ) $ 4,973 $ (582 ) $ 94 Dividends declared ($0.17 per share) * — — — (35 ) — 1 Net issuance for executive stock plan — 9 — — — — Net issuance of restricted stock — 8 (1 ) — — — Purchase of treasury stock — — (36 ) — — — Net earnings — — — 204 — 12 Other comprehensive income (loss) — — — — (41 ) (3 ) Balance, September 30, 2018 $ 3 $ 1,127 $ (1,581 ) $ 5,142 $ (623 ) $ 104 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, December 31, 2018 $ 3 $ 1,146 $ (1,585 ) $ 5,336 $ (674 ) $ 119 Dividends declared ($0.51 per share) * — — — (105 ) — (29 ) Contributions — — — — — 4 Net issuance for executive stock plan — (5 ) 8 — — — Net issuance of restricted stock — (12 ) 24 — — — Purchase of treasury stock — — (100 ) — — — Net earnings — — — 526 — 34 Other comprehensive loss — — — — (105 ) (7 ) Balance, September 30, 2019 $ 3 $ 1,129 $ (1,653 ) $ 5,757 $ (779 ) $ 121 BorgWarner Inc. stockholder's equity (in millions) Issued common stock Capital in excess of par value Treasury stock Retained earnings Accumulated other comprehensive income (loss) Noncontrolling interests Balance, December 31, 2017 $ 3 $ 1,118 $ (1,445 ) $ 4,531 $ (490 ) $ 109 Dividends declared ($0.51 per share) * — — — (106 ) — (34 ) Net issuance for executive stock plan — 10 5 — — — Net issuance of restricted stock — (1 ) 9 — — — Purchase of treasury stock — — (150 ) — — — Adoption of accounting standards — — — 16 (14 ) — Net earnings — — — 701 — 36 Other comprehensive income (loss) — — — — (119 ) (7 ) Balance, September 30, 2018 $ 3 $ 1,127 $ (1,581 ) $ 5,142 $ (623 ) $ 104 ____________________________________ * The dividends declared relate to BorgWarner common stock.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of accumulated other comprehensive income (loss)	(in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, June 30, 2019 $ (463 ) $ (1 ) $ (208 ) $ 2 $ (670 ) Comprehensive (loss) income before reclassifications (107 ) — 3 — (104 ) Income taxes associated with comprehensive (loss) income before reclassifications (7 ) — (1 ) — (8 ) Reclassification from accumulated other comprehensive loss — 1 3 — 4 Income taxes reclassified into net earnings — — (1 ) — (1 ) Ending balance, September 30, 2019 $ (577 ) $ — $ (204 ) $ 2 $ (779 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, June 30, 2018 $ (375 ) $ (3 ) $ (207 ) $ 3 $ (582 ) Comprehensive (loss) income before reclassifications (45 ) 2 (1 ) — (44 ) Income taxes associated with comprehensive (loss) income before reclassifications 2 — — — 2 Reclassification from accumulated other comprehensive loss — — 2 — 2 Income taxes reclassified into net earnings — — (1 ) — (1 ) Ending balance, September 30, 2018 $ (418 ) $ (1 ) $ (207 ) $ 3 $ (623 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, December 31, 2018 $ (441 ) $ — $ (235 ) $ 2 $ (674 ) Comprehensive (loss) income before reclassifications (127 ) (1 ) 7 — (121 ) Income taxes associated with comprehensive (loss) income before reclassifications (9 ) — (2 ) — (11 ) Reclassification from accumulated other comprehensive loss — 1 34 — 35 Income taxes reclassified into net earnings — — (8 ) — (8 ) Ending balance, September 30, 2019 $ (577 ) $ — $ (204 ) $ 2 $ (779 ) (in millions) Foreign currency translation adjustments Hedge instruments Defined benefit retirement plans Other Total Beginning balance, December 31, 2017 $ (294 ) $ (1 ) $ (198 ) $ 3 $ (490 ) Adoption of Accounting Standards — — (14 ) — (14 ) Comprehensive (loss) income before reclassifications (132 ) (4 ) 1 — (135 ) Income taxes associated with comprehensive (loss) income before reclassifications 8 1 — — 9 Reclassification from accumulated other comprehensive loss — 4 6 — 10 Income taxes reclassified into net earnings — (1 ) (2 ) — (3 ) Ending balance, September 30, 2018 $ (418 ) $ (1 ) $ (207 ) $ 3 $ (623 )

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lessee, Operating Lease, Disclosure	(in millions) September 30, 2019 Assets Operating lease assets Other non-current assets $ 88 Total operating lease assets $ 88 Liabilities Current Operating lease liabilities Accounts payable and accrued expenses $ 19 Noncurrent Operating lease liabilities Other non-current liabilities 68 Total operating lease liabilities $ 87
Lessee, Operating Lease, Liability, Maturity	Future minimum operating lease payments at December 31, 2018 were as follows: (in millions) 2019 $ 24 2020 21 2021 15 2022 13 2023 10 After 2023 38 Total minimum lease payments $ 121 (in millions) Operating Leases 2019 (excluding the nine months ended September 30, 2019) $ 5 2020 20 2021 15 2022 12 2023 9 After 2023 39 Total (undiscounted) lease payments $ 100 Less: Imputed interest 13 Present value of lease liabilities $ 87
Lease term and discount rate	Weighted-average remaining lease term (years) Operating leases 8 Finance leases 3 Weighted-average discount rate Operating leases 2.8 % Finance leases 3.3 %

Contingencies (Tables)

Contingencies (Tables)	9 Months Ended
	Sep. 30, 2019
Loss Contingencies [Line Items]
Change of Outstanding Asbestos-related Claims	2019 2018 Beginning Claims January 1 8,598 9,225 New Claims Received 1,667 1,460 Dismissed Claims (967 ) (1,430 ) Settled Claims (237 ) (268 ) Ending Claims September 30 9,061 8,987
Liability for Asbestos and Environmental Claims, Gross, Payment for Claims	(in millions) 2019 2018 Beginning asbestos liability as of January 1 $ 805 $ 828 Claim resolution costs and associated defense costs (33 ) (36 ) Ending asbestos liability as of September 30 $ 772 $ 792
Schedule of Loss Contingencies by Contingency	September 30, December 31, (in millions) 2019 2018 Assets: Other long-term asbestos-related insurance receivables $ 336 $ 303 Deferred asbestos-related insurance asset 49 83 Total insurance assets $ 385 $ 386 Liabilities: Accounts payable and accrued expenses $ 49 $ 50 Other non-current liabilities 723 755 Total accrued liabilities $ 772 $ 805

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Schedule of employee related and other restructuring accruals	Severance Accruals (in millions) Drivetrain Engine Total Balance at December 31, 2018 $ 4 $ 21 $ 25 Provision — 7 7 Cash payments — (20 ) (20 ) Balance at March 31, 2019 $ 4 $ 8 $ 12 Provision — 8 8 Cash payments — (2 ) (2 ) Balance at June 30, 2019 $ 4 $ 14 $ 18 Provision — 8 8 Cash payments (1 ) (7 ) (8 ) Balance at September 30, 2019 $ 3 $ 15 $ 18 Severance Accruals (in millions) Drivetrain Engine Total Balance at December 31, 2017 $ 4 $ 1 $ 5 Provision 1 1 2 Cash payments (1 ) (1 ) (2 ) Translation adjustment 1 — 1 Balance at March 31, 2018 $ 5 $ 1 $ 6 Provision 1 26 27 Cash payments (1 ) (5 ) (6 ) Balance at June 30, 2018 $ 5 $ 22 $ 27 Provision — 2 2 Cash payments (4 ) (6 ) (10 ) Balance at September 30, 2018 $ 1 $ 18 $ 19

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share amounts) 2019 2018 2019 2018 Basic earnings per share: Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701 Weighted average shares of common stock outstanding 205.3 207.5 205.9 208.5 Basic earnings per share of common stock $ 0.94 $ 0.98 $ 2.56 $ 3.36 Diluted earnings per share: Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701 Weighted average shares of common stock outstanding 205.3 207.5 205.9 208.5 Effect of stock-based compensation 1.0 1.2 0.9 1.3 Weighted average shares of common stock outstanding including dilutive shares 206.3 208.7 206.8 209.8 Diluted earnings per share of common stock $ 0.94 $ 0.98 $ 2.54 $ 3.34 Anti-dilutive stock-based awards excluded from the calculation of diluted earnings per share: 0.1 0.1 0.1 0.1

Reporting Segments (Tables)

Reporting Segments (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Net Sales by Reporting Segment	Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2019 2018 2019 2018 Engine $ 1,514 $ 1,516 $ 4,681 $ 4,906 Drivetrain 993 976 2,973 3,093 Inter-segment eliminations (15 ) (14 ) (45 ) (43 ) Net sales $ 2,492 $ 2,478 $ 7,609 $ 7,956
Segment Earnings Before Interest and Income Taxes	Three Months Ended September 30, Nine Months Ended (in millions) 2019 2018 2019 2018 Engine $ 241 $ 238 $ 731 $ 797 Drivetrain 100 108 307 345 Adjusted EBIT 341 346 1,038 1,142 Restructuring expense 14 5 41 44 Merger, acquisition and divestiture expense 4 2 10 5 Other expense (income) — 2 14 (3 ) Officer stock awards modification — 6 2 2 Corporate, including stock-based compensation 47 53 146 170 Equity in affiliates' earnings, net of tax (7 ) (15 ) (25 ) (38 ) Interest income (4 ) (1 ) (9 ) (4 ) Interest expense 15 14 43 45 Other postretirement (income) expense (1 ) (3 ) 26 (8 ) Earnings before income taxes and noncontrolling interest 273 283 790 929 Provision for income taxes 66 67 230 192 Net earnings 207 216 560 737 Net earnings attributable to the noncontrolling interest, net of tax 13 12 34 36 Net earnings attributable to BorgWarner Inc. $ 194 $ 204 $ 526 $ 701
Segment assets	September 30, December 31, (in millions) 2019 2018 Engine $ 4,638 $ 4,731 Drivetrain 3,865 3,920 Total 8,503 8,651 Corporate * 1,696 1,444 Total assets $ 10,199 $ 10,095 ____________________________________ * Corporate assets include investments and other long-term receivables and certain deferred income taxes.

Asset and Liabilities Held for

Asset and Liabilities Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2019
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Disposal Groups, Including Discontinued Operations	December 31, (millions of dollars) 2018 Receivables, net $ 15 Inventories, net 42 Prepayments and other current assets 12 Property, plant and equipment, net 45 Goodwill 7 Other intangible assets, net 20 Impairment of carrying value (94 ) Total assets held for sale $ 47 Accounts payable and accrued expenses $ 18 Other liabilities 5 Total liabilities held for sale $ 23

New Accounting Pronouncements (

New Accounting Pronouncements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 88
Operating Lease, Liability	87
Other non-current assets	484	$ 606	$ 502
Accounts Payable and Accrued Liabilities, Current	2,048	2,167	2,144
Other non-current liabilities	$ 444	437	$ 357
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		104
Operating Lease, Liability		103
Other non-current assets		104
Accounts Payable and Accrued Liabilities, Current		23
Other non-current liabilities		$ 80

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Net sales	$ 2,492	$ 2,478	$ 7,609	$ 7,956
Contract with Customer, Liability, Current	12		12		$ 13
Contract with Customer, Liability, Noncurrent	14		$ 14		17
Number of reportable segments | segment			2
Contract with Customer, Refund Liability, Current	2		$ 2		6
Revenue, Performance Obligation, Description of Payment Terms			30 to 90 days
Contract with Customer, Asset, after Allowance for Credit Loss	10		$ 10		11
Consolidated Entities [Member]
Net sales	2,492	2,478	7,609	7,956
Engine [Member]
Net sales	1,514	1,516	4,681	4,906
Drivetrain [Member]
Net sales	993	976	2,973	3,093
Europe [Member] | Consolidated Entities [Member]
Net sales	919	899	2,918	3,091
Europe [Member] | Engine [Member]
Net sales	716	690	2,277	2,343
Europe [Member] | Drivetrain [Member]
Net sales	203	209	641	748
Asia [Member] | Consolidated Entities [Member]
Net sales	681	694	1,997	2,220
Asia [Member] | Engine [Member]
Net sales	357	386	1,053	1,238
Asia [Member] | Drivetrain [Member]
Net sales	324	308	944	982
Other Foreign [Member] | Consolidated Entities [Member]
Net sales	39	41	116	118
Other Foreign [Member] | Engine [Member]
Net sales	30	33	91	95
Other Foreign [Member] | Drivetrain [Member]
Net sales	9	8	25	23
North America [Member] | Consolidated Entities [Member]
Net sales	853	844	2,578	2,527
North America [Member] | Engine [Member]
Net sales	397	392	1,216	1,186
North America [Member] | Drivetrain [Member]
Net sales	456	452	1,362	1,341
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss	36		36		29
Other Noncurrent Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 178		$ 178		$ 187
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years		3 years
Capitalized contract costs, amortization period			3 years
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	7 years		7 years
Capitalized contract costs, amortization period			7 years
Reportable Geographical Components [Member] | Engine [Member]
Net sales	$ 1,500	1,501	$ 4,637	4,862
Reportable Geographical Components [Member] | Drivetrain [Member]
Net sales	$ 992	$ 977	$ 2,972	$ 3,094

Research and Development Expe_3

Research and Development Expenditures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Research and Development
Gross R&D expenditures	$ 123	$ 122	$ 372	$ 386
Customer reimbursements	(21)	(14)	(53)	(49)
Net R&D expenditures	$ 102	$ 108	$ 319	$ 337
Maximum value of R&D contract	5.00%	5.00%	5.00%	5.00%

Other Expense, Net (Details)

Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring expense	$ 14		$ 5	$ 41	$ 44
Merger, acquisition and divestiture expense	4		2	10	5
Other operating expense		$ 14		12
Other operating income					(7)
Other expense, net	$ 18		$ 7	$ 63	42
Remy International Inc. [Member]
Other operating income					$ (4)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	29.20%	20.70%
Tax expense on gain from commercial settlement		$ 1
Tax benefits related to restructuring expense	$ 11	10
Effective rate reconciliation measurement period adjustments due to the Tax Act		20
Effective income tax reconciliation, other postretirement expense	6
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	13	11
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 22
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount		$ 22

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw material and supplies	$ 515	$ 485
Work in progress	114	114
Finished goods	195	199
FIFO inventories	824	798
LIFO reserve	(14)	(17)
Inventories, net	$ 810	$ 781

Property, Plant and Equipment_3

Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property Plant and Equipment
Total property, plant and equipment, gross	$ 4,065		$ 4,150
Less: accumulated depreciation	(1,480)		(1,473)
Property, plant and equipment, net, excluding tooling	2,585		2,677
Tooling, net of amortization	227		227
Property, plant and equipment, net	2,812		2,904
Capital Expenditures Incurred but Not yet Paid	60		104
Capitalized interest costs	13	$ 17
Land, land use rights and buildings [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	843		871
Machinery and equipment [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2,894		2,851
Capital leases [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2		2
Construction in progress [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	$ 326		$ 426

Product Warranty (Details)

Product Warranty (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Product warranty rollforward
Beginning balance, January 1	$ 103	$ 112
Provision for current period sales	36	38
Adjustments of prior estimates	9	9
Payments	(43)	(45)
Translation adjustment and other	(4)	(4)
Ending balance, September 30	101	110
Accounts payable and accrued expenses			$ 54	$ 56
Other non-current liabilities			47	47
Total product warranty liability	$ 101	$ 112	$ 101	$ 103

Notes Payable and Long-Term D_3

Notes Payable and Long-Term Debt (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2019EUR (€)	Dec. 31, 2018EUR (€)	Jul. 20, 2016USD ($)
Long-term debt
Long-term Debt	$ 2,042,000,000	$ 2,081,000,000
Current portion of long-term debt	386,000,000	140,000,000
Long-term debt, net of current portion	$ 1,656,000,000	$ 1,941,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	3.30%	4.30%	3.30%	4.30%
Debt weighted average interest rate	3.40%	3.40%	3.40%	3.40%
Current borrowing capacity	$ 1,200,000,000
Maximum borrowing capacity	1,500,000,000
Estimated fair value of senior unsecured notes	2,141,000,000	$ 2,058,000,000
Debt, difference between fair value and carrying value	104,000,000	(8,000,000)
Letters of Credit Outstanding, Amount	28,000,000	43,000,000
Short Term Borrowings [Member]
Short-term debt
Short-term borrowings	33,000,000	33,000,000
8.00% Senior Notes [Member]
Long-term debt
Long-term Debt	134,000,000	135,000,000
Debt instrument par value	$ 134,000,000	$ 134,000,000
Debt instrument stated interest rate	8.00%	8.00%	8.00%	8.00%
Debt instrument maturity date	Oct. 1, 2019	Oct. 1, 2019
4.625% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 251,000,000	$ 251,000,000
Debt instrument par value	$ 250,000,000	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%	4.625%	4.625%
Debt instrument maturity date	Sep. 15, 2020	Sep. 15, 2020
1.80% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 542,000,000	$ 570,000,000
Debt instrument par value | €			€ 500,000,000	€ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%	1.80%	1.80%
Debt instrument maturity date	Nov. 7, 2022	Nov. 7, 2022
3.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 497,000,000	$ 497,000,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	3.375%	3.375%	3.375%	3.375%
Debt instrument maturity date	Mar. 15, 2025	Mar. 15, 2025
7.125% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 119,000,000	$ 119,000,000
Debt instrument par value	$ 121,000,000	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%	7.125%	7.125%
Debt instrument maturity date	Feb. 15, 2029	Feb. 15, 2029
4.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 494,000,000	$ 494,000,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%	4.375%	4.375%
Debt instrument maturity date	Mar. 15, 2045	Mar. 15, 2045
Term Loan Facilities And Other [Member]
Long-term debt
Long-term Debt	$ 5,000,000	$ 15,000,000
Revolving Credit Facility [Member]
Long-term debt
Current borrowing capacity	1,200,000,000
Interest rate swaps
Long-term debt
Derivative, Notional Amount					$ 384,000,000
Commercial Paper [Member]
Long-term debt
Current borrowing capacity	1,200,000,000
2016 swap termination event [Member] | Unamortized portion of interest rate swap | 4.625% Senior Notes [Member]
Long-term debt
Derivative assets	$ 1,000,000	$ 2,000,000

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Valuation, Market Approach [Member]
Assets:
Foreign currency contracts	$ 2	$ 3
Net investment hedge contracts	28	12
Liabilities:
Foreign currency contracts	3	2
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Foreign currency contracts	0	0
Net investment hedge contracts	0	0
Liabilities:
Foreign currency contracts	0	0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Foreign currency contracts	2	3
Net investment hedge contracts	28	12
Liabilities:
Foreign currency contracts	3	2
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Foreign currency contracts	0	0
Net investment hedge contracts	0	0
Liabilities:
Foreign currency contracts	0	0
Valuation, Income Approach [Member]
Assets:
Other long-term receivables (insurance settlement agreement note receivable)	35	34
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Other long-term receivables (insurance settlement agreement note receivable)	0	0
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Other long-term receivables (insurance settlement agreement note receivable)	35	34
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Other long-term receivables (insurance settlement agreement note receivable)	$ 0	$ 0

Financial Instruments - Derivat

Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, zł in Millions, kr in Millions, $ in Millions, $ in Millions

9 Months Ended

12 Months Ended

Sep. 30, 2019PLN (zł)t

Dec. 31, 2018PLN (zł)t

Sep. 30, 2019KRW (₩)

Sep. 30, 2019USD ($)

Sep. 30, 2019JPY (¥)

Sep. 30, 2019MXN ($)

Sep. 30, 2019CNY (¥)

Sep. 30, 2019SEK (kr)

Sep. 30, 2019EUR (€)

Sep. 30, 2019GBP (£)

Dec. 31, 2018KRW (₩)

Dec. 31, 2018USD ($)

Dec. 31, 2018JPY (¥)

Dec. 31, 2018MXN ($)

Dec. 31, 2018CNY (¥)

Dec. 31, 2018SEK (kr)

Dec. 31, 2018EUR (€)

Dec. 31, 2018GBP (£)

Commodity contracts | Maturity December 2020

Derivative [Line Items]

Derivative, Nonmonetary Notional Amount, Mass | t

261

257

Brazil, Brazil Real | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

$ 2

$ 5

Brazil, Brazil Real | Foreign currency | Maturity January 2020

Derivative [Line Items]

Derivative, Notional Amount | €

€ 2

€ 4

United Kingdom, Pounds | Foreign currency | Maturity March 2020

Derivative [Line Items]

Derivative, Notional Amount

6

17

0

0

China, Yuan Renminbi | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

10

0

Euro Member Countries, Euro | Cross Currency Interest Rate Contract [Member] | Maturity September 2020

Derivative [Line Items]

Derivative, Notional Amount | €

206

Euro Member Countries, Euro | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

zł 7

zł 0

¥ 131

¥ 11

£ 1

¥ 0

¥ 0

£ 7

Euro Member Countries, Euro | Foreign currency | Maturity June 2020

Derivative [Line Items]

Derivative, Notional Amount | kr

kr 540

kr 540

Euro Member Countries, Euro | Foreign currency | Maturity December 2020

Derivative [Line Items]

Derivative, Notional Amount

9

19

Japan, Yen | Cross Currency Interest Rate Contract [Member] | Maturity February 2023

Derivative [Line Items]

Derivative, Notional Amount | ¥

10,978

Japan, Yen | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

₩ 1,359

1

¥ 23

₩ 5,785

3

¥ 89

Korea (South), Won | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

7

54

2

$ 7

266

6

Sweden, Kronor | Foreign currency | Maturity January 2020

Derivative [Line Items]

Derivative, Notional Amount | €

17

56

United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity September 2020

Derivative [Line Items]

Derivative, Notional Amount

250

United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity February 2023

Derivative [Line Items]

Derivative, Notional Amount

$ 100

United States of America, Dollars | Foreign currency | Maturity December 2019

Derivative [Line Items]

Derivative, Notional Amount

₩ 36,721

¥ 1,900

$ 153

₩ 0

¥ 0

$ 575

United States of America, Dollars | Foreign currency | Maturity January 2020

Derivative [Line Items]

Derivative, Notional Amount | €

€ 14

€ 0

Financial Instruments - Balance

Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	$ 32	$ (14)
Gain (loss) expected to be reclassified in one year or less	0
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2	2
Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	3	2
Not Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	1
Not Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Net investment hedge | Foreign currency
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	6	4
Gain (loss) expected to be reclassified in one year or less	0
Net investment hedge | Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	28	12
Gain (loss) expected to be reclassified in one year or less	0
Net investment hedge | Foreign currency denominated debt designated as a net investment hedge [Member]
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	(2)	(30)
Gain (loss) expected to be reclassified in one year or less	0
Net investment hedge | Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Net investment hedge | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	26	0
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2	12
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0	$ 0

Financial Instruments - Income

Financial Instruments - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Net sales	$ 2,492	$ 2,478	$ 7,609	$ 7,956
Cost of sales	1,968	1,963	6,053	6,270
Selling, general and administrative expenses	230	230	668	720
Other Comprehensive Income (Loss)	(109)	(41)	(105)	(119)
Cash Flow Hedging [Member] | Foreign currency | Net sales
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net	(2)	(1)	(4)	(2)
Cash Flow Hedging [Member] | Foreign currency | Cost of goods sold
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net	0	0	1	(3)
Cash Flow Hedging [Member] | Foreign currency | SG&A expense
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Gain (loss) reclassified from accumulated OCI into net income, effective portion, net	1	0	2	0
Net investment hedge | Cross Currency Interest Rate Contract [Member] | Interest expense and finance charges
Derivatives Designated As Net Investment Hedges Under Topic 815 Abstract
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	3	3	8	6
Not Designated as Hedging Instrument [Member] | Foreign currency | SG&A expense
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	1	(3)	0
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Foreign currency
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	2	(1)	(4)
Other Comprehensive Income (Loss) [Member] | Net investment hedge | Foreign currency
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2	0	2	0
Other Comprehensive Income (Loss) [Member] | Net investment hedge | Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	11	3	16	10
Other Comprehensive Income (Loss) [Member] | Net investment hedge | Foreign currency denominated debt designated as a net investment hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 23	$ 4	$ 28	$ 20

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Actual contribution to defined benefit pension plans			$ 12
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			63
Components of net periodic benefit cost:
Settlement			26	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 15		15
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	20		20
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit cost:
Service cost	0	$ 0	0	0
Interest cost	0	1	2	2
Expected return on plan assets	0	0	0	0
Settlement			0	0
Amortization of unrecognized prior service credit	(1)	(1)	(3)	(3)
Amortization of unrecognized loss	1	0	1	1
Net periodic benefit (income) cost	0	0	0	0
Defined benefit plan settlement with an insurance company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			50
Defined Benefit Plan, Plan Assets, Payment for Settlement			50
Defined benefit plan settlement by lump-sum payment to employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			13
UNITED STATES | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	2	2	7	6
Expected return on plan assets	(3)	(3)	(9)	(10)
Settlement			26	0
Amortization of unrecognized prior service credit	(1)	(1)	(1)	(1)
Amortization of unrecognized loss	2	1	4	3
Net periodic benefit (income) cost	0	(1)	27	(2)
Foreign Plan [Member] | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	5	5	14	14
Interest cost	3	3	9	9
Expected return on plan assets	(6)	(7)	(17)	(21)
Settlement			0	0
Amortization of unrecognized prior service credit	0	0	0	0
Amortization of unrecognized loss	2	1	7	5
Net periodic benefit (income) cost	$ 4	$ 2	$ 13	$ 7

Stock Based Compensation (Detai

Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Status of nonvested restricted stock
Net impact due to stock awards modification	$ 0			$ 6	$ 2	$ 2
Restricted Stock [Member]
Restricted stock compensation expense
Restricted stock compensation expense	8			7	22	19
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 45				$ 45
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition					1 year 10 months 24 days
Status of nonvested restricted stock
Nonvested shares subject to restriction, Beginning Balance	1,835,000	1,775,000	1,516,000		1,516,000
Nonvested shares subject to restriction, weighted average exercise price	$ 44.40	$ 44.77	$ 42.97		$ 42.97
Restricted shares granted to employees	22,000	125,000	930,000		1,054,006
Granted shares subject to restriction, weighted average exercise price	$ 36.68	$ 40.78	$ 41.92
Shares subject to restriction, Vested	(7,000)	(28,000)	(665,000)
Vested shares subject to restriction, weighted average exercise price	$ 43.81	$ 50.43	$ 35.94
Shares subject to restriction, Forfeited	(30,000)	(37,000)	(6,000)
Forfeited shares subject to restriction, weighted average exercise price	$ 44.99	$ 45.13	$ 45.41
Nonvested shares subject to restriction, Ending Balance	1,820,000	1,835,000	1,775,000		1,820,000
Nonvested shares subject to restriction, weighted average exercise price	$ 44.29	$ 44.40	$ 44.77		$ 44.29
Performance Shares [Member]
Status of nonvested restricted stock
Nonvested shares subject to restriction, Beginning Balance	427,000	478,000	297,000		297,000
Nonvested shares subject to restriction, weighted average exercise price	$ 57.03	$ 56.93	$ 60.35		$ 60.35
Restricted shares granted to employees		5,000	190,000
Granted shares subject to restriction, weighted average exercise price		$ 51.59	$ 51.52
Shares subject to restriction, Forfeited	(5,000)	(56,000)	(9,000)
Forfeited shares subject to restriction, weighted average exercise price	$ 57.29	$ 55.67	$ 55.30
Nonvested shares subject to restriction, Ending Balance	422,000	427,000	478,000		422,000
Nonvested shares subject to restriction, weighted average exercise price	$ 57.03	$ 57.03	$ 56.93		$ 57.03
Performance share compensation expense	$ 2			3	$ 5	6
Relative Revenue Growth Performance Share Plans [Member]
Status of nonvested restricted stock
Nonvested shares subject to restriction, Beginning Balance	427,000	478,000	297,000		297,000
Nonvested shares subject to restriction, weighted average exercise price	$ 45.11	$ 45.04	$ 47.03		$ 47.03
Restricted shares granted to employees		5,000	190,000
Granted shares subject to restriction, weighted average exercise price		$ 41.92	$ 41.90
Shares subject to restriction, Forfeited	(5,000)	(56,000)	(9,000)
Forfeited shares subject to restriction, weighted average exercise price	$ 44.76	$ 44.24	$ 44.12
Nonvested shares subject to restriction, Ending Balance	422,000	427,000	478,000		422,000
Nonvested shares subject to restriction, weighted average exercise price	$ 45.11	$ 45.11	$ 45.04		$ 45.11
Performance share compensation expense	$ 3			$ 5	$ 3	$ 13
2018 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	7,000,000				7,000,000
Number of shares available for grant	6,000,000				6,000,000
First Half Vested | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of awards vested					50.00%
Vesting period					2 years
Second Half Vested | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Director [Member] | Restricted Stock [Member]
Status of nonvested restricted stock
Restricted shares granted to employees					23,880

Stockholder's Equity (Details)

Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Common Stock, Dividends, Per Share, Declared		$ 0.17	$ 0.17	$ 0.51	$ 0.51
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 4,578		$ 4,578			$ 4,345
Contributions from noncontrolling interest stockholders				4	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption									$ (14)
Net earnings attributable to BorgWarner Inc.		194	$ 204	526	701
Net earnings attributable to the noncontrolling interest, net of tax		13	12	34	36
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(109)	(41)	(105)	(119)
Other comprehensive loss attributable to the noncontrolling interest	[1]	(5)	(3)	(7)	(7)
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		3	3	3	3	$ 3	3	$ 3		$ 3
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,129	1,127	1,129	1,127	1,116	1,146	1,110		1,118
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(1,653)	(1,581)	(1,653)	(1,581)	(1,653)	(1,585)	(1,544)		(1,445)
Treasury Stock, Value, Acquired, Cost Method			(36)	(100)	(150)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		5,757	5,142	5,757	5,142	5,598	5,336	4,973		4,531
Dividends, Common Stock, Cash		(35)	(35)	(105)	(106)
Cumulative Effect of New Accounting Principle in Period of Adoption									16
Net earnings attributable to BorgWarner Inc.		194	204	526	701
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(779)	(623)	(779)	(623)	(670)	(674)	(582)		(490)
Cumulative Effect of New Accounting Principle in Period of Adoption									$ (14)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(109)	(41)	(105)	(119)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		121	104	121	104	$ 108	$ 119	$ 94		$ 109
Dividends, Common Stock, Cash		1	1	(29)	(34)
Contributions from noncontrolling interest stockholders		4		4
Net earnings attributable to the noncontrolling interest, net of tax		13	12	34	36
Other comprehensive loss attributable to the noncontrolling interest		(5)	(3)	(7)	(7)
Performance Shares [Member] | Additional Paid-in Capital [Member]
APIC, Share-based Payment Arrangement, Recognition and Exercise		4	9	(5)	10
Performance Shares [Member] | Treasury Stock [Member]
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		1	0	8	5
Restricted Stock [Member] | Additional Paid-in Capital [Member]
APIC, Share-based Payment Arrangement, Recognition and Exercise		9	8	(12)	(1)
Restricted Stock [Member] | Treasury Stock [Member]
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		$ (1)	$ (1)	$ 24	$ 9
[1]	Net of income taxes.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative Effect of New Accounting Principle in Period of Adoption							$ (14)
Foreign currency translation adjustments
Beginning Balance	$ (463)	$ (375)	$ (441)	$ (294)
Comprehensive income (loss) before reclassifications	(107)	(45)	(127)	(132)
Income taxes associated with comprehensive income (loss) before reclassifications	(7)	2	(9)	8
Reclassification from accumulated other comprehensive income (loss)	0	0	0	0
Income taxes reclassified into net earnings	0	0	0	0
Ending Balance	(577)	(418)	(577)	(418)
Hedge instruments
Beginning Balance	(1)	(3)	0	(1)
Comprehensive income (loss) before reclassifications	0	2	(1)	(4)
Income taxes associated with comprehensive income (loss) before reclassifications	0	0	0	1
Reclassification from accumulated other comprehensive income (loss)	1	0	1	4
Income taxes reclassified into net earnings	0	0	0	(1)
Ending Balance	0	(1)	0	(1)
Defined benefit postretirement plans
Beginning Balance	(208)	(207)	(235)	(198)
Comprehensive income (loss) before reclassifications	3	(1)	7	1
Income taxes associated with comprehensive income (loss) before reclassifications	(1)	0	(2)	0
Reclassification from accumulated other comprehensive income (loss)	3	2	34	6
Income taxes reclassified into net earnings	(1)	(1)	(8)	(2)
Ending Balance	(204)	(207)	(204)	(207)
Other
Beginning Balance	2	3	2	3
Comprehensive income (loss) before reclassifications	0	0	0	0
Income taxes associated with comprehensive income (loss) before reclassifications	0	0	0	0
Reclassification from accumulated other comprehensive income (loss)	0	0	0	0
Income taxes reclassified into net earnings	0	0	0	0
Ending Balance	2	3	2	3
Total
Beginning Balance	(670)	(582)	(674)	(490)
Comprehensive income (loss) before reclassifications	(104)	(44)	(121)	(135)
Income taxes associated with comprehensive income (loss) before reclassifications	(8)	2	(11)	9
Reclassification from accumulated other comprehensive income (loss)	4	2	35	10
Income taxes reclassified into net earnings	(1)	(1)	(8)	(3)
Ending Balance	$ (670)	$ (582)	$ (674)	$ (490)	$ (779)	$ (623)

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 88		$ 88
Operating Lease, Liability	87		87
Operating Lease, Cost	6		19
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	5		5
Lessee, Operating Lease, Liability, Payments, Due Year Two	20		20
Lessee, Operating Lease, Liability, Payments, Due Year Three	15		15
Lessee, Operating Lease, Liability, Payments, Due Year Four	12		12
Finance Lease, Liability, Payments, Due Year Five	9		9
Lessee, Operating Lease, Liability, Payments, Due after Year Five	39		39
Lessee, Operating Lease, Liability, Payments, Due	100		100
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 13		$ 13
Operating Leases, Rent Expense		$ 12		$ 33
Operating Leases, Future Minimum Payments Due, Next Twelve Months					$ 24
Operating Leases, Future Minimum Payments, Due in Two Years					21
Operating Leases, Future Minimum Payments, Due in Three Years					15
Operating Leases, Future Minimum Payments, Due in Four Years					13
Operating Leases, Future Minimum Payments, Due in Five Years					10
Operating Leases, Future Minimum Payments, Due Thereafter					38
Operating Leases, Future Minimum Payments Due					$ 121
Operating Lease, Weighted Average Remaining Lease Term	8 years		8 years
Finance Lease, Weighted Average Remaining Lease Term	3 years		3 years
Operating Lease, Weighted Average Discount Rate, Percent	2.80%		2.80%
Finance Lease, Weighted Average Discount Rate, Percent	3.30%		3.30%
Operating Lease, Payments			$ 19
Minimum [Member]
Lessee, Operating Lease, Renewal Term	1 year		1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term	5 years		5 years
Finance Lease, Right-of-Use Asset, Amortization			$ 1
Finance Lease, Interest Expense			1
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 88		88
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	19		19
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 68		$ 68

Contingencies (Details)

Contingencies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)claimsite	Sep. 30, 2018USD ($)claim	Dec. 31, 2018USD ($)
Accrual for environmental loss contingencies [Abstract]
Waste disposal sites with potential liability under the Comprehensive Environmental Response, Compensation and Liability Act | site	27
Accrual for indicated environmental liabilities	$ 8		$ 9
Loss Contingency Claims [Roll Forward]
Loss Contingency, Range of Possible Loss, Portion Not Accrued	100		100
Loss Contingency Accrual [Roll Forward]
Beginning asbestos liability	805	$ 828
Claim resolution costs and associated defense costs	(33)	(36)
Ending asbestos liability	$ 772	$ 792
Asbestos Issue [Member]
Loss Contingency Claims [Roll Forward]
Beginning Claims | claim	8,598	9,225
New Claims Received | claim	1,667	1,460
Dismissed Claims | claim	(967)	(1,430)
Settled Claims | claim	(237)	(268)
Ending Claims | claim	9,061	8,987
Company paid in defense and indemnity in advance of insurers reimbursement	$ 608		574
Cash and notes received from insurers	272		271
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	32	$ 37
Assets:
Insurance Settlements Receivable, Noncurrent	336		303
Deferred asbestos-related insurance asset	49		83
Total insurance assets	385		386
Liabilities:
Accounts payable and accrued expenses	49		50
Other non-current liabilities	723		755
Total accrued liabilities	$ 772		$ 805

Restructuring (Details)

Restructuring (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Provision	$ 14			$ 5			$ 41	$ 44
Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Provision								6
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	18	$ 12	$ 25	27	$ 6	$ 5	25	5
Provision	8	8	7	2	27	2
Cash payments	(8)	(2)	(20)	(10)	(6)	(2)
Translation adjustment						1
Ending Balance	18	18	12	19	27	6	18	19
Employee Severance [Member] | Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	4	4	4	5	5	4	4	4
Provision	0	0	0	0	1	1
Cash payments	(1)	0	0	(4)	(1)	(1)
Translation adjustment						1
Ending Balance	3	4	4	1	5	5	3	1
Employee Severance [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	14	8	21	22	1	1	21	1
Provision	8	8	7	2	26	1
Cash payments	(7)	(2)	(20)	(6)	(5)	(1)
Translation adjustment						0
Ending Balance	15	$ 14	$ 8	18	$ 22	$ 1	15	18
Emissions [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Provision	3			$ 5			14	$ 38
Structural costs reduction actions [Member] | Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Provision	1
Structural costs reduction actions [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Provision	3
Voluntary termination [Member] | Employee Severance [Member] | Engine [Member]
Restructuring Reserve [Roll Forward]
Provision	$ 7						18
Corporate, Non-Segment [Member]
Restructuring Reserve [Roll Forward]
Provision							$ 3

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	0.1	0.1	0.1	0.1
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 194	$ 204	$ 526	$ 701
Weighted average shares of common stock outstanding	205.3	207.5	205.9	208.5
Basic earnings per share of common stock	$ 0.94	$ 0.98	$ 2.56	$ 3.36
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 194	$ 204	$ 526	$ 701
Weighted average shares of common stock outstanding	205.3	207.5	205.9	208.5
Effect of stock-based compensation	1	1.2	0.9	1.3
Weighted average shares of common stock outstanding including dilutive shares	206.3	208.7	206.8	209.8
Diluted earnings per share of common stock	$ 0.94	$ 0.98	$ 2.54	$ 3.34

Reporting Segments (Details)

Reporting Segments (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				2
Net Sales by Reporting Segment
Net sales		$ 2,492	$ 2,478	$ 7,609	$ 7,956
Adjusted earnings before interest, income taxes and noncontrolling interest
Adjusted EBIT		341	346	1,038	1,142
Restructuring expense		14	5	41	44
Merger, acquisition and divestiture expense		4	2	10	5
Other expense (income), net		0	2	14	(3)
Officer stock awards modification		0	6	2	2
Corporate, including stock-based compensation		47	53	146	170
Equity in affiliates’ earnings, net of tax		(7)	(15)	(25)	(38)
Interest income		(4)	(1)	(9)	(4)
Interest expense		15	14	43	45
Other postretirement (income) expense		(1)	(3)	26	(8)
Earnings before income taxes and noncontrolling interest		273	283	790	929
Provision for income taxes		66	67	230	192
Net earnings		207	216	560	737
Net earnings attributable to the noncontrolling interest, net of tax		13	12	34	36
Net earnings attributable to BorgWarner Inc.		194	204	526	701
Segment Reporting Information - Assets
Total assets		10,199		10,199		$ 10,095
Operating Segments [Member]
Segment Reporting Information - Assets
Total assets		8,503		8,503		8,651
Engine [Member]
Net Sales by Reporting Segment
Net sales		1,514	1,516	4,681	4,906
Adjusted earnings before interest, income taxes and noncontrolling interest
Adjusted EBIT		241	238	731	797
Segment Reporting Information - Assets
Total assets		4,638		4,638		4,731
Drivetrain [Member]
Net Sales by Reporting Segment
Net sales		993	976	2,973	3,093
Adjusted earnings before interest, income taxes and noncontrolling interest
Adjusted EBIT		100	108	307	345
Restructuring expense					6
Segment Reporting Information - Assets
Total assets		3,865		3,865		3,920
Intersegment Eliminations [Member]
Net Sales by Reporting Segment
Net sales		(15)	$ (14)	(45)	$ (43)
Corporate, Non-Segment [Member]
Adjusted earnings before interest, income taxes and noncontrolling interest
Restructuring expense				3
Segment Reporting Information - Assets
Total assets	[1]	$ 1,696		$ 1,696		$ 1,444
[1]	Corporate assets include investments and other long-term receivables and certain deferred income taxes.

Recent Transactions (Details)

Recent Transactions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Jan. 02, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Payments for investments in equity securities		$ 52	$ 4
Payments for business acquired	$ 10	10	$ 0
Business Combination, Contingent Consideration, Liability		5
Goodwill		$ 1,818			$ 1,853
Cascadia Motion [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jan. 2, 2019
Payments for business acquired		$ 15
Other intangible assets				$ 5
Goodwill				7
Other assets and liabilities				$ 2
Minimum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		2 years
Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Series A-1 Preferred Stock of Romeo Power Technology [Member]
Business Acquisition [Line Items]
Payments for investments in equity securities		$ 50
Romeo Power Technology [Member]
Business Acquisition [Line Items]
Ownership Percentage in Investee		20.00%
BorgWarner Romeo Power LLC [Member]
Business Acquisition [Line Items]
Total equity from shareholders' initial capital contribution		$ 10
Noncontrolling Interest, Ownership Percentage by Parent		60.00%

Asset and Liabilities Held fo_2

Asset and Liabilities Held for Sale (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimated proceeds from disposition of business		$ 28
Proceeds from sale of business	$ 27
Receivables, net		15
Inventories, net		42
Prepayments and other current assets		12
Property, plant and equipment, net		45
Goodwill		7
Other intangible assets, net		20
Impairment of carrying value		(94)
Assets held for sale	0	47
Accounts payable and accrued expenses		18
Other liabilities		5
Liabilities held for sale	$ 0	$ 23