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Recent Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Recent Transactions (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Jan. 02, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Payments for investments in equity securities			$ 48	$ 3
Payments for business acquired		$ 10	10	$ 0
Business Combination, Contingent Consideration, Liability	$ 5		5
Goodwill	1,845		$ 1,845				$ 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]
Equity Securities without Readily Determinable Fair Value, Amount	50		$ 50
Payments for investments in equity securities	$ 46
Romeo Power Technology [Member]
Business Acquisition [Line Items]
Ownership Percentage in Investee	20.00%		20.00%
Scenario, Forecast [Member] \| Joint Venture between BorgWarner and Romeo Power Technology [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent					60.00%