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Recent Transactions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Recent Transactions (Details) - USD ($) $ in Millions	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. 02, 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%