Basis of Presentation	6 Months Ended
Jun. 30, 2018
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 six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The balance sheet as of December 31, 2017 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, 2017. As disclosed in the Form 8-K dated June 15, 2018, the Company announced that it would restate its consolidated financial statements for the fiscal years ended December 31, 2016 and 2015 included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, due to the Company’s re-evaluation of its accounting in those years for the estimated value of asbestos-related claims that had not yet been asserted and their associated defense costs. The restatement does not affect the current financial results reported on this Quarterly Report on Form 10-Q, nor does it affect the Company’s previously reported results for the fiscal year ended December 31, 2017. For more information concerning the restatement, please see the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission ("SEC") on June 15, 2018. Certain prior period amounts have been reclassified to conform to current period presentation. During the fourth quarter of 2017, the Company identified a prior period error related to the exclusion of the net earnings attributable to the non-controlling interest in the first three and six months of 2017 Consolidated Statement of Comprehensive Income. The inclusion of this amount increased total Comprehensive Income by $9.1 million and $19.5 million for the three and six months ended June 30, 2017, respectively. The Company concluded that the error was not material to the financial statements of any prior annual or interim period and therefore, amendments of previously filed reports are not required. In accordance with ASC Topic 250, "Accounting Changes and Error Corrections," we have corrected the error for all prior periods presented by revising the consolidated financial statements appearing herein. Quarterly periods not presented herein will be revised, as applicable, in future filings. The revision had no impact on the Consolidated Balance Sheets, Consolidated Statements of Operations, Consolidated Statements of Cash Flows. 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.

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 six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The balance sheet as of December 31, 2017 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, 2017. As disclosed in the Form 8-K dated June 15, 2018, the Company announced that it would restate its consolidated financial statements for the fiscal years ended December 31, 2016 and 2015 included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, due to the Company’s re-evaluation of its accounting in those years for the estimated value of asbestos-related claims that had not yet been asserted and their associated defense costs. The restatement does not affect the current financial results reported on this Quarterly Report on Form 10-Q, nor does it affect the Company’s previously reported results for the fiscal year ended December 31, 2017. For more information concerning the restatement, please see the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission ("SEC") on June 15, 2018.

Certain prior period amounts have been reclassified to conform to current period presentation. During the fourth quarter of 2017, the Company identified a prior period error related to the exclusion of the net earnings attributable to the non-controlling interest in the first three and six months of 2017 Consolidated Statement of Comprehensive Income. The inclusion of this amount increased total Comprehensive Income by $9.1 million and $19.5 million for the three and six months ended June 30, 2017, respectively.

The Company concluded that the error was not material to the financial statements of any prior annual or interim period and therefore, amendments of previously filed reports are not required. In accordance with ASC Topic 250, "Accounting Changes and Error Corrections," we have corrected the error for all prior periods presented by revising the consolidated financial statements appearing herein. Quarterly periods not presented herein will be revised, as applicable, in future filings. The revision had no impact on the Consolidated Balance Sheets, Consolidated Statements of Operations, Consolidated Statements of Cash Flows.

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.