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 in the fourth quarter of 2019.

Subsequent Event

9 Months Ended

Sep. 30, 2019

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 in the fourth quarter of 2019.